Martin Audio Ikon IK81 User manual

User Guide
iKON Series
Amplifiers
V2.3

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 1
…………
Martin Audio iKon Amplifier User Guide
Contents
Martin Audio iKon Amplifier User Guide ..........................................................................................................................................1
Contents ........................................................................................................................................................................................... 1
IMPORTANT SAFETY INSTRUCTIONS ................................................................................................................................................ 5
CONSIGNES DE SÉCURITÉ IMPORTANTES.........................................................................................................................................6
AVERTISSEMENT DE SECURITE ..................................................................................................................................................... 6
AVERTISSEMENT DE SECURITE ..................................................................................................................................................... 6
AVERTISSEMENT DE SECURITE ..................................................................................................................................................... 6
COMPLIANCE .................................................................................................................................................................................... 7
FOR CUSTOMERS IN EUROPE........................................................................................................................................................7
FOR CUSTOMERS IN THE USA.......................................................................................................................................................7
FOR CUSTOMERS IN CANADA.......................................................................................................................................................8
Thanks and Unpacking...................................................................................................................................................................... 8
Unpacking the Martin Audio iK42/iK81 Series Amplifier..............................................................................................................8
INSTALLATION INSTRUCTIONS.......................................................................................................................................................... 9
Mechanical Installation................................................................................................................................................................. 9
AC Power Connection ................................................................................................................................................................. 10
The User Guide ............................................................................................................................................................................... 11
Introduction and Key Features .......................................................................................................................................................12
Introduction................................................................................................................................................................................ 12
Key Features ............................................................................................................................................................................... 12
Audio Connections.......................................................................................................................................................................... 14
Input Connections ...................................................................................................................................................................... 14
Using unbalanced connections ................................................................................................................................................... 14
Amplifier Output Connections.................................................................................................................................................... 14
Load Matching ............................................................................................................................................................................ 16
Panel Layouts.................................................................................................................................................................................. 17
Quick start ...................................................................................................................................................................................... 20
Loading XE500 (or XE300 Bi-amp) Presets..................................................................................................................................20
Loading XE300 Passive Presets ...................................................................................................................................................21
Operation ....................................................................................................................................................................................... 23
Starting up the unit..................................................................................................................................................................... 23
Overview of Modules, Presets Components and Snapshots ......................................................................................................23
Navigation................................................................................................................................................................................... 24
The Home Page........................................................................................................................................................................... 25
Drive Modules ............................................................................................................................................................................ 25

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 2
…………
Drive Module Presets ................................................................................................................................................................. 25
Component Presets .................................................................................................................................................................... 25
Factory Module Presets.............................................................................................................................................................. 25
Storing Module Presets .............................................................................................................................................................. 26
Recalling Module Presets ........................................................................................................................................................... 26
Recalling Components ................................................................................................................................................................ 26
Input ............................................................................................................................................................................................... 27
AES3 Inputs................................................................................................................................................................................. 27
Dante™ Inputs ............................................................................................................................................................................ 27
Automatic Input Selection (Fallover) ..........................................................................................................................................27
Gain and Polarity ........................................................................................................................................................................ 27
Delay........................................................................................................................................................................................... 28
High Pass Filter ........................................................................................................................................................................... 28
Parametric Equalisation.............................................................................................................................................................. 28
FIR Shelving EQ ........................................................................................................................................................................... 28
Parametric Filters........................................................................................................................................................................ 28
Routing ....................................................................................................................................................................................... 28
Output ............................................................................................................................................................................................ 29
Gain and Polarity ........................................................................................................................................................................ 29
Delay........................................................................................................................................................................................... 29
High and Low pass Filters ........................................................................................................................................................... 29
LIR Crossover Filtering ................................................................................................................................................................ 29
Parametric Equalisation.............................................................................................................................................................. 29
Limiters ....................................................................................................................................................................................... 29
VX Limiter ................................................................................................................................................................................... 29
Tmax Thermal Limiter................................................................................................................................................................. 30
Xmax Excursion Limiter............................................................................................................................................................... 30
Bridge.......................................................................................................................................................................................... 30
Routing ....................................................................................................................................................................................... 31
Driver .......................................................................................................................................................................................... 31
Utility Pages .................................................................................................................................................................................... 32
Screen Contrast .......................................................................................................................................................................... 32
Stereo Linking ............................................................................................................................................................................. 32
Current Ethernet IP Address.......................................................................................................................................................32
IP Mode ...................................................................................................................................................................................... 32
IP Static....................................................................................................................................................................................... 32
Store Snapshot ........................................................................................................................................................................... 32
Recall Snapshot........................................................................................................................................................................... 32
Bandwidth Units ......................................................................................................................................................................... 32

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 3
…………
Aux Style ..................................................................................................................................................................................... 32
ECO ............................................................................................................................................................................................. 32
External Breaker Protection (EBP) .............................................................................................................................................. 33
Ethernet.......................................................................................................................................................................................... 33
Ethernet configurations.............................................................................................................................................................. 33
DHCP........................................................................................................................................................................................... 33
AUTO-IP ...................................................................................................................................................................................... 33
Static-IP....................................................................................................................................................................................... 33
IP Troubleshooting...................................................................................................................................................................... 33
Snapshots ....................................................................................................................................................................................... 34
AUX Port ......................................................................................................................................................................................... 34
Latency delay.................................................................................................................................................................................. 35
Secure Mode................................................................................................................................................................................... 36
Overlay Flush .................................................................................................................................................................................. 36
Revert to Factory Settings .............................................................................................................................................................. 36
Protection Systems......................................................................................................................................................................... 36
Summary of Protection Indication..............................................................................................................................................36
Incident Reporting ...................................................................................................................................................................... 37
Fault Relay .................................................................................................................................................................................. 37
Performance Logging.................................................................................................................................................................. 37
Vu-Net ............................................................................................................................................................................................ 38
TIPI Control ..................................................................................................................................................................................... 39
Protocol Overview ...................................................................................................................................................................... 39
Physical layer .............................................................................................................................................................................. 39
General frame format................................................................................................................................................................. 39
Addressing .................................................................................................................................................................................. 39
Commands.................................................................................................................................................................................. 40
Responses................................................................................................................................................................................... 40
MethodNames............................................................................................................................................................................ 40
Security....................................................................................................................................................................................... 40
Parameter Values ....................................................................................................................................................................... 40
Script Examples........................................................................................................................................................................... 41
Tipi Methods for IKON Amplifiers............................................................................................................................................... 41
Power Draw & Thermal Dissipation................................................................................................................................................42
iK42............................................................................................................................................................................................. 42
iK81............................................................................................................................................................................................. 43
Processing Block Diagram............................................................................................................................................................... 44
Input Menu Map............................................................................................................................................................................. 45
Output Menu Map.......................................................................................................................................................................... 46

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 4
…………
Utility Menu Map ........................................................................................................................................................................... 47
EQ and Filter Response Graphs ......................................................................................................................................................48
Technical Specifications.................................................................................................................................................................. 51
General ....................................................................................................................................................................................... 51
Audio .......................................................................................................................................................................................... 51
Digital processing........................................................................................................................................................................ 51
Power Output iK42 ..................................................................................................................................................................... 52
Power Output iK81 ..................................................................................................................................................................... 52
Power supply .............................................................................................................................................................................. 52
Protection systems ..................................................................................................................................................................... 52
Power distribution protection systems ......................................................................................................................................52
Monitoring and logging .............................................................................................................................................................. 52
Physical ....................................................................................................................................................................................... 53
Options ....................................................................................................................................................................................... 53

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 5
…………
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves or other apparatus (including amplifiers)
that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding type plug. A polarized plug has two blades with one
wider than the other. A grounding type plug had two blades and a third grounding prong. The wide blade or the third
prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
10. Protect the power cable from being walked on or pinched particularly at plugs, convenience receptacles and the point
where they exit from the apparatus.
11. Only use attachments / accessories specified by the manufacturer.
12. Use only with the cart, tripod, bracket or table specified by the manufacturer, or sold with the apparatus. When a cart
is used, use caution when moving the cart / apparatus combination to avoid injury from tip-over.
13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualified service personnel. Service is required when the apparatus has been damaged in any way,
such as power-supply cable or plug damaged, liquid has been spilled or objects have fallen into the apparatus, this
apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
SAFETY WARNING
Do not remove any covers, loosen any fixings or allow items to enter any aperture.
SAFETY WARNING
The rear of the product may get hot. Avoid direct skin contact during operation and for at least 5 minutes after power has been
isolated.
SAFETY WARNING
The product must only be positioned at floor level when operated in a horizontal position.

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 6
…………
CONSIGNES DE SÉCURITÉ IMPORTANTES
1. Lisez ces instructions.
2. Conservez ces instructions.
3. Respectez tous les avertissements.
4. Suivez toutes les instructions.
5. Ne pas utiliser cet appareil près de l'eau.
6. Nettoyer uniquement avec un chiffon sec.
7. Ne pas bloquer les ouvertures de ventilation. Installer conformément aux instructions du fabricant.
8. Ne pas installer près de sources de chaleur telles que radiateurs, registres de chaleur, poêles ou autres appareils (y
compris les amplificateurs) qui produisent de la chaleur.
9. Ne supprimez pas le dispositif de sécurité de la fiche polarisée ou mise à la terre. Une fiche polarisée possède deux
lames dont l'une est plus large que l'autre. Une prise de terre a eu deux lames et une troisième broche de terre. La lame
large ou la troisième broche sont fournies pour votre sécurité. Si la fiche fournie ne rentre pas dans votre prise,
consultez un électricien pour remplacer la prise obsolète.
10. Protéger le cordon d'alimentation soit écrasé ou pincé, particulièrement au niveau des fiches, des prises et le point où
ils sortent de l'appareil.
11. Utilisez uniquement les accessoires spécifiés par le fabricant.
12. Utilisez uniquement le chariot, le trépied, le support ou la table spécifiés par le fabricant, ou vendu avec l'appareil.
Quand un chariot est utilisé, soyez prudent lorsque vous déplacez l'ensemble chariot / appareil afin d'éviter toute
blessure en cas de chute.
13. Débranchez cet appareil pendant les orages ou lorsqu'il n'est pas utilisé pendant de longues périodes de temps.
14. Adressez-vous à un personnel qualifié. Une réparation est requise lorsque l'appareil a été endommagé de quelque
façon que ce soit le cordon d'alimentation ou la fiche endommagé, du liquide a été renversé ou des objets sont tombés
dans l'appareil, cet appareil a été exposé à la pluie ou à l'humidité, ne fonctionne pas normalement, ou s'il est tombé.
15. Le dispositif ne doit pas être exposé à des gouttes ou des éclaboussures et aucun objet rempli de liquides, tels que des
vases, doit être placé sur l'appareil.
16. Déconnexion permanente de l'alimentation secteur doit être atteint en supprimant le connecteur du cordon fourni à
l'arrière de l'unité. Ce connecteur doit être facilement utilisable.
AVERTISSEMENT DE SECURITE
Ne retirez pas les couvercles, ne desserrez pas les fixations et ne laissez aucune pièce s'introduire dans les ouvertures.
AVERTISSEMENT DE SECURITE
Le radiateur arrière de cet appareil devient chaud. Evitez tout contact direct avec la peau pendant le fonctionnement et au moins
5 minutes après la mise hors tension de l'appareil.
AVERTISSEMENT DE SECURITE
Le produit ne doit être positionné au niveau du sol lorsqu'il est utilisé en position horizontale.

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 7
…………
COMPLIANCE
FOR CUSTOMERS IN EUROPE
This product complies with both the LVD (electrical safety) 73/23/EEC and EMC (electromagnetic compatibility) 89/336/EEC
directives issues by the commission of the European community.
Compliance with these directives implies conformity with the following European standards:
EN60065 Product safety
EN55103-1 EMC emissions
EN55103-2 EMC immunity
This product is intended for the following electromagnetic environments: E1, E2; E3 & E4.
THIS PRODUCT MUST BE EARTHED. Use only a flexible cable or cord with a green and yellow core which must be connected to
the protective earthing terminal of a suitable mains plug or the earthing terminal of the installation. The cord must be a maximum
of 2m long, have a 2.5mm2 CSA, a 300/500V rating and comply with EN50525-2-11 / H05W-F.
THIS PRODUCT IS DESIGNED FOR PERMANENT INSTALLATION. It must be fitted in to a 19” rack enclosure and not operated unless
so installed. The rack enclosure should be open at the front and back to allow free ventilation and movement of air through the
product.
FOR CUSTOMERS IN THE USA
This product complies with UL60065 7th edition.
THIS PRODUCT MUST BE EARTHED. Use only a flexible cable or cord with a green or green / yellow core which must be connected
to the protective earthing terminal of a suitable mains plug or the earthing terminal of the installation. The cord must be a
maximum of 6’ long, be 14AWG, have a rating SJ, SJT, SJE or 300/500V H05W-F and be marked VW-1.
THIS PRODUCT IS DESIGNED FOR PERMANENT INSTALLATION. It must be fitted in to a 19” rack enclosure and not operated unless
so installed. The rack enclosure should be open at the front and back to allow free ventilation and movement of air through the
product.
DECLARATION OF CONFORMITY WITH FCC RULES
We, Martin Audio Ltd. of Century Point, Halifax Road, Cressex Business Park, High Wycombe, HP12 3SL, England, declare under
our sole responsibility that this family of devices, complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
FEDERAL COMMUNICATIONS COMMISSION NOTICE
An example of this equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part
15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential and
commercial installation.
This equipment generates, uses, and can radiate radio frequency energy, and if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will
not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which
can be determined by turning the equipment off and on, the user is encouraged to try and correct the interference by one or
more of the following measures:
Reorient or relocate the receiving antenna.
Increase the distance between the equipment and the receiver.
Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user’s
authority to operate this equipment.

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 8
…………
FOR CUSTOMERS IN CANADA
This product complies with CA /CSA C22.2 No.60065-03
Ce produit est conforme avec CA /CSA C22.2 No.60065-03
THIS PRODUCT MUST BE EARTHED. Use only a flexible cable or cord with a green or green / yellow core which must be connected
to the protective earthing terminal of a suitable mains plug or the earthing terminal of the installation. The cord must be a
maximum of 6’ long, be 14AWG, have a rating SJ, SJT, SJE or 300/500V H05W-F and be marked VW-1.
CE PRODUIT DOIT ÊTRE MIS À LA TERRE. Utilisez uniquement un câble souple avec un noyau vert ou vert / jaune qui doit être
relié à la borne de terre de connecteur d'alimentation ou la borne de terre de l'installation. Le cordon doit être un maximum de
6' (2m) de long, 14 AWG (2.5mm2 CSA), être classé SJ, SJT, SJE ou 300/500V H05W-F et être marquée VW-1
THIS PRODUCT IS DESIGNED FOR PERMANENT INSTALLATION. It must be fitted in to a 19” rack enclosure and not operated unless
so installed. The rack enclosure should be open at the front and back to allow free ventilation and movement of air through the
product.
CE PRODUIT EST CONÇU POUR UNE INSTALLATION PERMANENTE. Il doit être installé dans un boîtier rack 19 ". Le rack devrait
être ouvert à l'avant et l'arrière pour permettre la ventilation et le mouvement d'air libre à travers le produit .
DECLARATION OF CONFORMITY WITH CANADIAN ICES-003
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.
Thanks and Unpacking
Thank you for choosing a Martin Audio iK42/iK81 Series Advanced System Amplifier for your application. Please spare a little
time to study the contents of this manual, so that you obtain the best possible performance from this unit.
All Martin Audio products are carefully engineered for world-class performance and reliability.
If you would like further information about this or any other Martin Audio product, please contact us. We look forward to helping
you in the near future.
Unpacking the Martin Audio iK42/iK81 Series Amplifier
After unpacking the unit please check carefully for damage. If damage is found, please notify the carrier concerned at once. You,
the consignee, must instigate any claim. Please retain all packaging in case of future re-shipment.

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 9
…………
INSTALLATION INSTRUCTIONS
Mechanical Installation
The iK42/iK81 Series Amplifier system is designed to be mounted in a standard 19” rack enclosure.
Where the amplifier is used in a fixed installation, as long as the bottom unit is supported and there are no gaps between units,
it is acceptable to use only the front panel 19” rack holes when fitting it in a standard rack enclosure. If the amplifier is mounted
in a mobile rack it is important that the rear is supported with a rear rack mounting kit (part number IKRACK). Damage caused
by insufficient support is not covered by the warranty.
To prevent damage to the front panel it is recommended that plastic cups or washers are fitted underneath the rack mounting
bolt heads.
It is possible to mount multiple iK42/iK81 Series amplifiers without ventilation gaps between them but it is essential that an
unobstructed flow of clean air is available from the front of the unit to the rear. It is important that neither the air intakes on the
front of the unit or the exhaust vents at the rear are covered. Steps must be taken to ensure that hot air does not continually
circulate through the amplifiers from the back of the rack to the front.
The amplifier should never be exposed to rain or moisture during operation or storage. If the unit does come into contact with
moisture, remove the AC power cable immediately and leave it in a dry and warm location to dry out.
Note that when any equipment is taken from a cold location into a hot humid one, condensation may occur inside the device.
Always allow time for the equipment to attain the same temperature as its surrounding environment before connecting the AC
power cable.
IMPORTANT

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 10
…………
It is the responsibility of the user to ensure that dirt, liquids and vapour from theatrical smoke and fog machines is not ingested
by the amplifier. Damage so caused is not covered by the manufacturer’s warranty.
AC Power Connection
The amplifier utilises a 32A Neutrik PowerCon™ type locking AC power connector. Use only an AC power cable with a correctly
terminated PowerCon™ type connector to make the connection to the mains power supply.
The amplifiers are designed to operate on 50/60 Hz AC power. The power supply sections automatically configure themselves
for either 115V or 230V nominal voltage at turn on. The amplifiers will operate over an extended range of supply voltages (please
refer to the technical specifications). The thresholds of these ranges are as follows; -
115V range: 75 - 138Vrms
230V range: 138 - 275Vrms
Note that whilst the amplifier will operate correctly at voltages indicated, the specified output power will only be achieved when
operating with the stated nominal voltages.
Once an amplifier has configured itself for a particular range it will not change range, even if the mains voltage varies wildly,
unless power is completely interrupted for several seconds or is cycled by the user.
During start-up the amplifier asses the mains environment, displaying one of the following messages if a problem is detected
with the quality of the incoming mains supply.
Problem and IKON LCD
screen Message
Description of the problem
Mains too low
During start-up the unit waits for the mains to settle within either the 115V or 230V ranges. If the
mains is taking a long time to settle and the voltage measured is below the 115V range this message
is displayed.
Mains too high
During start-up the unit waits for the mains to settle within either the 115V or 230V ranges. If the
mains is taking a long time to settle and the voltage measured is above the 230V range this message
is displayed.
Mains unstable
During start-up the unit waits for the mains to settle within either the 115V or 230V ranges and
remain there for a settling time. If the mains is taking a long time to settle but the voltage measured
is currently in either the 115V or 230V ranges this message is displayed.
When an amplifier is running normally the mains is continuously monitored to ensure that it remains within the initially selected
range. If the mains voltage is outside that range the amplifier will enter a protection mode and briefly display the message below.
When in this mode audio will be muted but communication will still be possible.
Fault: Mains out of range
Amplifier was running but the measured mains voltage was outside the initial range.
While in a protection mode caused by an unstable mains supply the amplifier will continually monitor the mains and
automatically resume normal operation if it is assessed to be stable and within the initial range selected when the unit was first
powered up. While the mains remains out of range one of the messages above will be displayed

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 11
…………
The User Guide
This user manual gives a progressively more detailed description of the functions of the Martin Audio iK42/iK81 Series Advanced
System Amplifiers. A single page quick reference guide is provided for those users who are experienced with this type of
equipment and just need to know how to ‘drive’ the front panel. A detailed explanation of the front and rear panel controls and
indicators is contained in the next section.
The final section describes each individual function or feature with annotated images explaining its use. Where appropriate, the
graphical display is shown to further elaborate on the units operation.
To complete the manual a reference section is included, describing the technical performance of the device complete with graphs
of filter responses.

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 12
…………
Introduction and Key Features
Introduction
The Martin Audio iK42/iK81 Series Advanced System Amplifier represents current state-of-the-art technology in several areas.
This product is the result of several years of research, from which many advances in switched mode power technologies and ever
finer detail in signal processing have stemmed. Taking advantage of the latest advances in analogue to digital conversion
technologies, the unit achieves performance levels among the very best that engineering permits.
Below is a list of key features, followed by some information on the major advanced features of the product.
Key Features
Four/Eight channels of sonically pure Class D amplification
Very high power density - packs four channels and 20kW or eight channels and 10kW into just 2U of rack space
Packed with robust protection and monitoring systems to keep the show going
External Breaker Protection (EBP) limits the current draw to prevent breakers opening
Martin Audio minimal signal path design
Class leading sonic performance achieved by the use of state of the art Amplifier technologies and highly advanced DSP
algorithms using Linea Micro Detail (LMD)
96kHz sampling frequency provides for a nominally flat response beyond 40kHz.
Rotary encoders, illuminated buttons and graphical display provide a rapid, intuitive and user-friendly control interface
High speed Ethernet communications supporting DHCP, static-IP and auto-IP and direct connection to a computer
without the need for a router or a switch
Powerful Drive Module concept, abstraction from device centric to speaker based control
Innovative Component Presets to allow individual outputs to be used for selected drivers of a loudspeaker system
Twelve layers of Parameter Overlays for trouble-free Grouping
Unique VX limiter providing dynamic control for passive 2-way enclosures
Unique LIR linear phase crossover shapes giving FIR-like performance without the drawbacks
Linear phase HF system EQ profiling which provides perfect integration between enclosures
Innovative excursion control limiter with sliding High Pass Filter; limits only the damaging low frequencies
Transducer thermal modelling provides regulation limiters, addressing long term overload
Overshoot limiter governs amplitude of transient signals retaining average power whilst constraining peak energy
Dante audio networking with automatic fall-over to Analogue or AES3
AES3 inputs
Drive Modules
The iK42/iK81 Series processor has a new way of ordering and grouping channels in order to give a more speaker-based approach
to controlling, designing and recalling speaker configurations; these are called Drive Modules. A Drive Module is the Processing
provided by one Input DSP Block, and a number of Output DSP Blocks, which are associated with one-another by means of
routing. For example, if Input DSP Block B is routed to Outputs 3 and 4, then this is a 2-way Drive Module with Input DSP Block B
forming the ‘Master’ control, and Output DSP Blocks 3 and 4 providing the driver-related control. Overall, this forms the
processing typically for one loudspeaker sub-system. The Vu-Net Drive Module control panel for this sub-system may then be
used for control and monitoring of the associated speaker.
Drive Modules may be included in Module Groups, which use the Parameter Overlay feature in the Device to achieve trouble-
free Grouping in the Vu-Net application.
The Presets in the Device are Drive-Module centric, and are used to configure individual Drive Modules rather than the whole
device.
Importantly, Drive Modules move the focus away from the processing device, and onto the loudspeaker systems.
A Drive Module Preset may be broken apart into Components, allowing any output to be used for any component within a Drive
Module Preset (i.e. any driver in a loudspeaker subsystem).
See Overview of Modules
Overlays

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 13
…………
When the Device is used in Modules view in Vu-Net, this allows the modules to be grouped into Overlay Groups. These groups
allow various Input (master) parameters to be adjusted in all modules in that group, whist maintaining independent parameter
values across each group. This is achieved in the device by combining the parameters for all the layers for a given section (Gain
Delay, EQ etc.). When an Overlay parameter is active, the Overlay indicator will become illuminated. The combined Gain or Delay
etc. associated with a given section is shown on the module panel in Vu-Net, within square brackets [ ] under the Delay and Gain
for each input channel. The combined EQ curve is shown in an olive colour. The Input Mute button in Vu-Net will flash if an
overlay mute is active. On the device, the presence of an active overlay is generally indicated by square brackets “[]” after the
parameter value on the display. An input overlay mute is indicated on the mute/clip indicator for that channel flashing. Note that
overlay parameters cannot be adjusted on the Device itself; these can only be controlled by the Vu-Net application. However,
overlay parameters may be removed on the device – see Overlay Flush. Note that overlays are not stored in presets or snapshots
or carried in settings files.
LIR Linear Phase Crossover Filtering The Device also includes a new type of crossover filtering “Linear Impulse Response” (LIR)
crossover filtering, which results in a Linear Phase crossover that has a constant delay regardless of frequency (unlike other types
of crossover which delay different frequencies to a different extent, thus smearing the arrival time). The LIR crossover can thus
be described as having a flat Group Delay response, and thus entirely free of Group Delay Distortion.
The shape of the LIR crossover filter is quite similar to a 4th order or 24dB/Oct Linkwitz-Riley filter, and maintains zero phase
difference between the adjacent bands across the crossover region to keep the polar response rock steady.
FIR Linear Phase Equalisation
The Input High-Shelf Equalisers use Finite Impulse Response (FIR) filtering to produce Linear Phase equalisation; that is all
frequencies are delayed by the same amount, perfectly preserving the transient response. This can also be important in
applications where different amounts of EQ are applied to different parts of a speaker cluster, such as to add 'Throw' EQ boost
so that parts of cluster which are throwing further can have HF absorption correction added. If this EQ is not linear phase, then
the zones where the speakers combine may suffer frequency response anomalies.

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 14
…………
Audio Connections
Input Connections
For each input channel there is a female XLR connector for analogue inputs. There is also one female XLR for one stream (two
channels) of AES3 digital audio. Note that only two channels of AES3 digital audio are available. The Dante option permits more
channels of Digital Audio inputs.
The HOT, + or ‘in phase’ connection should be made to pin 2 of the XLR connector.
The COLD, - or ‘out of phase’ connection should be made to pin 3 of the XLR connector.
Pin 1 of the XLR connectors is internally connected to the chassis. The shield of the input cable should always be connected Pin
1 of the XLR to ensure that EMC performance and regulations are met.
3
Using unbalanced connections
Please note that the use of unbalanced connections is not recommended, however when connecting the amplifier to an
unbalanced audio source, the signal conductor should be connected to XLR pin2. The ‘Cold’ conductor or cable screen should be
connected to XLR pin 1 with a short connection made between pin 1 and pin 3.
Amplifier Output Connections
The iK42 amplifier is fitted with one Speakon™ connector per amplifier channel. The appropriate conductor terminations are
shown below and on the rear panel of the unit.

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 15
…………
Amplifier output connections – iK42
2-
Additionally, the channel 2 output is duplicated on the Speakon™ connector for amplifier channel 1 for Bi-Amp wiring. Similarly,
the channel 4 output is duplicated on the Speakon™ connector for amplifier channel 3. This can be useful for making a connection
to two loudspeakers with one 4-core cable (i.e. Bi-Amp).
On the iK81 model, all outputs are Bi-Amp; each Speakon™ connector carries two amplifier outputs – Channels 1&2, Channels
3&4, Channels 5&6 and Channels 7&8.
Amplifier output connections – iK81 and Bi Amp
In addition, the channel 1 or channel 3 connector (all the Speakon™ connectors on the iK81 model) can also be used if the pair
of amplifier channels is being operated in bridged mode.
Amplifier output connections – Bridge
More than one speaker can be connected to each channel provided the total impedance per channel is not less than 2 ohms. In
bridged mode the minimum total impedance should not be less than 4 ohms.

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 16
…………
Load Matching
Each output of the device can be optimised to drive either a low impedance load (e.g. 2, 4 or 8 Ohms), or a Constant Voltage
(C.V.) using the Load parameter in the Output menu. There are several C.V. settings (25V, 70V and 100V Line) which determine
the maximum RMS voltage that the amplifier will produce. Select the one which is appropriate for the installation. A number of
low impedance settings (depending on the model) are also available. Although it is not critical that this setting matches the
impedance of the connected load, this will maximise the power that is available for the load.

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 17
…………
Panel Layouts
(The iK42 is illustrated. The iK81 is similar, but with double the quantity of
output indicators and mute buttons)
1. Power Switch- Applies mains power to the device. If the device has entered
Sleep mode, it may be woken up again either from the Vu-Net application, or
by switching this switch off, then on again.
2. Graphical Display- This will show the Home screen; a useful overview of
channel allocation. On most pages the currently selected channel and
parameter information is displayed on the upper part of the screen and the
parameter value on the lower part of the screen. The screen contrast can be
changed by pressing the <UTILITY> button to navigate to “Screen” and using
the encoders to change the percentage; this can also optimise the viewing
angle.
3. Status Indicators- The “OVERLAY” indicator shows when there are
parameters active on a group layer, which the user cannot access through the
front panel of the device (see Overlay Flush). The “DANTE” indicator shows
that a Dante network feed is routed. The “ONLINE” indicator has three states:
Off – the unit is offline and not connected to a computer or network. Flashing-
the unit is searching for an IP address; if the unit does not find an IP address
the unit will assign itself an IP address automatically and the indicator will stop
flashing. On- the unit is online and connected with software. IP settings can be
viewed or changed within the <UTILITY> pages. The “AES3 IN” indicator
illuminates when one or more of the inputs is using an AES3 source.
4. Parameter Encoders- Two velocity sensitive parameter encoders are used to
adjust parameters shown on the display. Up to three parameters at a time are
displayed on the screen. The parameter name is shown above the parameter
value in each of the three screen sections. Use SELECT to highlight the
parameter, then ADJUST to change it.
5.Page Selection Buttons- When one of the buttons <INPUT>, <OUTPUT> or
<UTILITY> is illuminated, the up <> and down <>arrows will also illuminate,
informing the user that these buttons may be used to scroll through the
various pages of parameters that may be viewed and edited. The <ENTER>
button is used to confirm an operation such as storing or recalling a preset or
snapshot. It will illuminate when the user is being invited to press it. It will flash
when warning the user that pressing this button will activate an important
function.
6.Menu Buttons- There are three buttons to determine which section of the
device to view or edit. The <OUTPUT> button displays pages of parameters
associated with a particular output channel. The <INPUT> button displays
pages of parameters associated with a particular input socket or input DSP
channel. Pressing <INPUT> or <OUTPUT> buttons repeatedly will scroll through
the inputs/outputs of the device. After the last channel, navigation returns to
the Home screen. The <UTILITY> button displays pages of miscellaneous
parameters not associated with any particular channel. Whilst in Edit mode,
one of these three buttons will be illuminated. They are mutually exclusive –
pressing one of the buttons will deselect any others that are active. Pressing
Utility will escape back to the Home screen.
7. Input Signal Indicators- A set of five indicators show “Sig”, “-12”, “0dBu”,
“+6” and “+12” and “Clip (mute)” for each of the DSP inputs “A” “B” “C” “D”.

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 18
…………
The signal present Indicators operate at approximately –40 dBu. The Clip/mute Indicators warn the user of input overload and
operate at 1dB before clip. This indicator also shows a muted input
8. Mute Buttons- DSP output mute status is indicated and controlled by an illuminated button for each channel. These flash when
the entire unit is muted from the AUX port or from Vu-Net Mute-All, or if this channel has been muted by the protection systems.
9. Bridge Indicator- This will illuminate when the channel pair is in Bridge mode. The controls for the left channel of the pair will
determine the settings. See Bridge Mode
10. Amplifier Indicator- This indicates when the amplifier protection systems are reducing the gain to keep the parameters of
the amplifier within specification, or when that the channel is clipping.
11. Driver Indicator- This indicates a signal 6dB higher than the limiter threshold, or when the threshold of the excursion limiter
has been exceeded, or when the thermal limiter is active. Please note that because of the long release time of the thermal limiter,
this indicator may remain illuminated for several seconds after signal on that channel is reduced.
12. Limiter Indicators- The output indicators shows the status of the limiter and output level. The level indicated is that before
the limiter, referenced to the limiter threshold. The <SIG> indicator shows when a signal is present on the output. The second
indicator <-6dB> shows that the signal has reached 6dB below the limiter threshold. The third <LIMIT> indicator indicates that
the threshold of that output channel has been reached.

iK81 / iK42 USER GUIDE
iK81 / iK42 User Guide V2.3 19
…………
1. Loudspeaker Connectors (iK81). The amplifier Speakon™ outputs. Connect the
first loudspeaker to the 1+ and 1- terminals and the second loudspeaker to the 2+
and 2- terminals. For Bridged mode, use terminals 1+ and 2+.
2. Loudspeaker Connectors (iK42). The amplifier Speakon™ outputs. Connect the
loudspeaker to the 1+ and 1- terminals. CH1 also carries the (duplicated)
loudspeaker output for channel 2 on terminals 2+ and 2-. Similarly, CH3 carries the
loudspeaker output for channel 4 on terminals 2+ and 2-. For Bridged mode, use
terminals 1+ and 2+ of either CH1 or CH3.
3. Analogue Audio Link Connectors- Carries a duplicate (parallel) connection (to
another amplifier for example).
4. Analogue Audio Input Connectors- All audio connections are fully balanced and
wired: pin-1 to ground (as required by the AES48 standard), pin-2 hot & pin-3 cold.
5. AES3 Audio Input Connectors- For inputting Digital Audio signals. The Input is fully
balanced and wired: pin-1 to ground, pin-2 data+ & pin-3 data. The Link connector
allows a buffered AES3 signal to be passed on to another device.
6. Dante Ports- Connection ports for Dante™ with the Primary and Secondary port
convention available.
7. Ethernet Communications Port- The amplifier may be controlled entirely using
Martin audio's Vu-Net software and so can integrate easily with other products that
are supported on the same platform such as the Multicellular range, CDD-Live, DD12
and PSX. Connection will normally be made via this Ethernet port connector. This
port is also used for updating the firmware in the unit.
8. Auxiliary Port- The auxiliary port may be configured to recall snapshots or apply
muting.
9. Power Inlet- The unit should be connected to a suitable mains electricity supply
using an earthed 32 amp PowerCon connection power lead. The device has a switch
mode power supply that is capable of operating with a nominal mains voltage of
100V to 230V, 50/60Hz without re-configuration.
NOTE: The device must be earthed to a suitable power earth; failure to do so may
affect performance and/or operation and will invalidate warranty and could be
potentially hazardous.
10. Relay output- This isolated relay output may be used to indicate abnormal
conditions to external monitoring apparatus. See Fault Relay