Linea Research ASC-48 User manual

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LNR series processors ASC-48 Processor
Linea Research
ASC-48 Advanced System Controller
User Guide
Version 8 (For firmware version 1.460 and above)

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Contents
IMPORTANT SAFETY INSTRUCTIONS.......................................................................................................5
CONSIGNES DE SÉCURITÉ IMPORTANTES...............................................................................................6
COMPLIANCE...........................................................................................................................................7
FOR CUSTOMERS IN EUROPE..............................................................................................................7
FOR CUSTOMERS IN THE USA .............................................................................................................8
FOR CUSTOMERS IN CANADA .............................................................................................................9
FOR CUSTOMERS IN SINGAPORE........................................................................................................9
Thanks and Unpacking ..........................................................................................................................10
Unpacking the Linea Research ASC-48 series controller ..................................................................10
INSTALLATION INSTRUCTIONS..............................................................................................................10
Mechanical Installation.....................................................................................................................10
AC Power Connection .......................................................................................................................11
The User Guide......................................................................................................................................12
Introduction and Key Features .............................................................................................................13
Introduction ......................................................................................................................................13
Key Features..................................................................................................................................13
Audio Connections................................................................................................................................16
Input Connections.............................................................................................................................16
Output Connections..........................................................................................................................16
Using unbalanced connections .........................................................................................................17
Panel Layouts ........................................................................................................................................18
Operation..............................................................................................................................................20
Starting up the unit...........................................................................................................................20
Overview of Modules, Presets Components and Snapshots............................................................20
Drive Modules...................................................................................................................................21
Drive Module Presets........................................................................................................................22
Navigation and Designing Crossovers...............................................................................................23
Factory Module Presets ....................................................................................................................23
Storing Module Presets.................................................................................................................23
Recalling Module Presets..............................................................................................................24
Recalling Components ..................................................................................................................24
Input..................................................................................................................................................25

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AES3 / Network Inputs..................................................................................................................25
Automatic Input Selection (Fallover) ............................................................................................25
Gain and Polarity...........................................................................................................................25
Delay .............................................................................................................................................26
High Pass Filter..............................................................................................................................26
Parametric Equalisation................................................................................................................26
FIR Shelving EQ..............................................................................................................................26
Parametric Filters..........................................................................................................................26
Routing..........................................................................................................................................27
Output...............................................................................................................................................27
AES3 outputs.................................................................................................................................27
Gain and Polarity...........................................................................................................................27
Delay .............................................................................................................................................27
High and Low pass Filters..............................................................................................................27
LIR Crossover Filtering...................................................................................................................27
Parametric Equalisation and All-Pass Filters.................................................................................28
FIR Filter (available on some models)...........................................................................................28
Limiters..........................................................................................................................................28
Amplifier Gain ...............................................................................................................................30
Routing..........................................................................................................................................30
AES3 ..............................................................................................................................................30
Utility Pages ......................................................................................................................................30
Screen Contrast.............................................................................................................................30
Stereo Linking................................................................................................................................30
Current Ethernet IP Address .........................................................................................................30
IP Mode.........................................................................................................................................31
IP Static..........................................................................................................................................31
Store Snapshot..............................................................................................................................31
Recall Snapshot.............................................................................................................................31
Bandwidth Units............................................................................................................................31
Aux Style........................................................................................................................................31
Ethernet ............................................................................................................................................31
Ethernet configurations ................................................................................................................31
DHCP .............................................................................................................................................31

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AUTO-IP.........................................................................................................................................32
Static-IP .........................................................................................................................................32
IP Troubleshooting........................................................................................................................32
Snapshots..........................................................................................................................................32
AUX Port............................................................................................................................................33
Latency delay ....................................................................................................................................34
Input/Output Latencies.................................................................................................................34
Processing Latencies .....................................................................................................................34
Secure Mode.....................................................................................................................................35
Overlay Flush.....................................................................................................................................35
Revert to Factory Settings.................................................................................................................35
Tipi Third Party Interface ..................................................................................................................36
Processing Block Diagram .....................................................................................................................37
Input Menu Map Utility Menu Map....................................................................................38
Output Menu Map................................................................................................................................39
EQ and Filter Response Graphs.............................................................................................................40
Technical Specifications ........................................................................................................................43
Connectors........................................................................................................................................43
Environmental...................................................................................................................................43
Dimensions........................................................................................................................................43
Options..................................................................................................................................................44

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IMPORTANT SAFETY INSTRUCTIONS
The lightning bolt triangle is used to alert the user
to the risk of electric shock.
The exclamation point triangle is used to alert the user to important
operating or maintenance instructions.
1Read these instructions.
2Keep these instructions.
3Heed all warnings.
4Follow all instructions.
5Do not use this apparatus near water.
6Clean only with dry cloth.
7Do not block any ventilation openings. Install in accordance with the manufacturer's instructions.
8Do not install near any heat sources such as radiators, heat registers, stoves or other apparatus (including
amplifiers) that produce heat.
9Do 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 cord 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 cord 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.
15 The apparatus shall not be exposed to dripping or splashing and no objects filled with liquids, such as vases, shall
be placed on the apparatus.
16 Permanent disconnection from the mains supply is to be achieved by removing the supplied cord connector from
the back of the unit. This connector must remain readily operable.
WARNING
Do not remove any covers, loosen any fixings or allow items to enter any aperture.
WARNING
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
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.
WARNING
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 must allow free air movement through the
product.

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CONSIGNES DE SÉCURITÉ IMPORTANTES
Le triangle de l'éclair est utilisé pour alerter l'utilisateur
À risque d'électrocution.
Le triangle du point d'exclamation est utilisé pour alerter l'utilisateur sur des
importants
Instructions d'utilisation ou d'entretien.
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.
ATTENTION
Ne retirez pas les couvercles, ne desserrez pas les fixations et ne laissez aucune pièce s'introduire
dans les ouvertures.
ATTENTION
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.
ATTENTION
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.
ATTENTION
Ce produit est conçu pour une installation permanente. Il doit être installé dans un boîtier rack 19 ".
L'enceinte du rack doit permettre un mouvement de l'air libre à travers le produit.

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COMPLIANCE
FOR CUSTOMERS IN EUROPE
This product complies with both the LVD (electrical safety) 2014/35/EU and EMC (electromagnetic
compatibility) 2014/30/EU directives issued by the commission of the European Union.
Compliance with these directives is demonstrated by conformity with the following European
standards:
EN60065 8th Edition Electrical safety
EN55032-2012 EMC emissions
EN55035-2017 EMC immunity
ATTENTION
This equipment is compliant with Class A of CISPR 32. In a residential environment this equipment
may cause radio interference in which case the user may be required to take separate measures.
WARNING
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 at least a 0.75mm2CSA, a
300/500V rating and comply with EN50525-2-11 / H05W-F (105oC).

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FOR CUSTOMERS IN THE USA
This product complies with UL60065 8th edition for electrical safety.
WARNING
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 at least 18AWG,
105oC have a rating SJ, SJT, SJE or 300/500V H05W-F and be marked VW-1.
ATTENTION
FCC SUPPLIER'S DECLARATION OF CONFORMITY (SDoC) : We, Linea Research Ltd. of 1 Marquis
Business Centre, Royston Road, Baldock, Hertfordshire, SG7 6XL, England, represented in the United
States by Allied Professional Technologies, LLC - www.alliedprotech.com , declare under our sole
responsibility that the ASC family of products comply with Part 15 of the FCC Rules. Products
covered by this declaration have model numbers of the form ASCxx where 'x' may be any number
between 1 and 9.
FCC NOTE : An example of this equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to part 15 subpart B of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency energy
and, if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the interference at his
own expense.
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.

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FOR CUSTOMERS IN CANADA
This product complies with CA /CSA C22.2 No.60065-03 for electrical safety.
Ce produit est conforme avec CA /CSA C22.2 No.60065-03 pour la sécurité électrique.
DECLARATION OF CONFORMITY WITH CANADIAN ICES-003.
This Class A digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.
WARNING
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’ (2m) long, be at least
18AWG, (0.75mm2CSA), 105oC have a rating SJ, SJT, SJE or 300/500V H05W-F and be marked VW-1.
WARNING
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, être d'au moins 18 AWG
(0.75mm2CSA), 105oC être classé SJ, SJT, SJE ou 300/500V H05W-F et être marquée VW-1
FOR CUSTOMERS IN SINGAPORE
This product complies with IEC60065 8th edition for electrical safety.
WARNING
THIS EQUIPMENT IS ONLY FOR PROFESSIONAL INSTALLATION and must only be used with a flexible,
certified mains power cord-set. This cord-set must be a maximum of 2m long, have at least a
0.75mm2CSA, a 300/500V rating and be terminated in a mains plug compliant with Singapore
standard SS145-1:2010.
ATTENTION
THIS PRODUCT MUST BE EARTHED. Ensure that the earth terminal of the certified cord-set is
connected to the protective earthing system of the installation.

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Thanks and Unpacking
Thank you for choosing a Linea Research ASC-48 advanced system controller 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 Linea Research products are carefully engineered for world-class performance and reliability.
If you would like further information about this or any other Linea Research product, please contact
us. We look forward to helping you in the near future.
Unpacking the Linea Research ASC-48 series controller
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.
INSTALLATION INSTRUCTIONS
Mechanical Installation
The ASC Series Processor must only be operated when mounted in a standard 19” rack
enclosure.
482
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433
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Where the processor 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 mounting points
when fitting it in a standard rack enclosure. If the processor is mounted in a mobile rack it is
important that either the rear is supported or that it is positioned directly between other supported
units. Damage caused by insufficient support is not covered by the manufacturer's warranty.
To prevent damage to the front panel it is recommended that plastic cups or washers are fitted
underneath the rack mounting bolt heads.
IMPORTANT
General
The ASC 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 cord immediately and leave it in a dry and
warm location.
Note that when any equipment is taken from a cold location into a warm 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 cord.
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 unit. Damage so caused is not covered by the manufacturer’s
warranty.
Cooling
It is important that the air intake on the left side of the chassis and the exhaust vents on the right
side are not obstructed. Steps must also be taken to ensure that hot air does not continually
circulate through the rack.
It is possible to mount multiple ASC processors without ventilation gaps between them but it is
essential that an unobstructed flow of clean air is available from the left side of the chassis to the
right-front of the unit to the rear.
AC Power Connection
The ASC Series Processors are designed to operate from an 85V to 254V 50/60Hz mains supply and
utilise a standard C14 IEC mains power connector. Use only a C14 IEC power cord correctly
terminated with a plug suitable for the territory where the product will be used. It is the
responsibility of the user to ensure that all wiring is performed by a qualified person in accordance
with all local regulations.

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The User Guide
This user manual gives a progressively more detailed description of the functions of the Linea
Research ASC-48 series advanced system controller. 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.

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Introduction and Key Features
Introduction
The Linea Research ASC-48 Advanced System Controller represents current state-of-the-art
technology. Taking advantage of the latest advances in analogue to digital conversion and digital
signal processing technologies the unit achieves performance levels higher than previous devices.
Below is a list of key features, followed by some information on the major advancements of the ASC
feature set.
Key Features
-Linea Research minimal signal path design
-96kHz sampling frequency provides for a nominally flat response beyond 40kHz.
-Three rotary encoders, illuminated buttons and graphical display provide a rapid, intuitive
and user-friendly control interface
-High speed capable and flexible Ethernet communications that supports DHCP, static-IP and
auto-IP and direct connection to a computer without the need for a router or a switch
-Class leading sonic performance achieved by the use of state of the art converters, a 4th
Generation Analogue Devices Sharc DSP and highly advanced DSP algorithms
-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 with minimal latency
and without requiring a design
-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 fallover to Analogue or AES3
-AES3 inputs and outputs, switchable in pairs
-High performance ‘universal mains’ switch mode power supply, designed in-house
Drive Modules
The ASC-48 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
System Engineer Drive Module control panel for this sub-system may then be used for control and
monitoring of the associated speaker.

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Drive Modules may be included in Module Groups, which use the Parameter Overlay feature in the
ASC48 to achieve trouble-free Grouping in the System Engineer application.
The Presets in the ASC48 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
When the ASC is used in Modules view in System Engineer, 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 System
Engineer, 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 System Engineer 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 ASC device itself; these can only be controlled by the System Engineer 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 ASC 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.

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FIR Output Processing (available on some models)
Each output has a Finite Impulse Response (FIR) filter which may be programmed using a 3rd party
application for further Equalisation and phase correction. Such FIRs may be designed for Linear
Phase response, either for equalisation or from linear phase crossovers.

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Audio Connections
Input Connections
For each input channel there is a female XLR input connector. Even channel numbers are for
Analogue inputs only. Odd channel numbers are either for Analogue inputs (when in Analogue input
mode) or for AES3 input pairs (when in AES3 input mode).
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.
2 1
3
Pin 2 HOT +
Pin 3 COLD -
Pin 1 Shield
Input XLR balanced connection
Output Connections
For each output channel there is a male XLR input connector. Even channel numbers are for
Analogue outputs only. Odd channel numbers are either for Analogue outputs (when in Analogue
output mode) or for AES3 output pairs (when in AES3 output mode).
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 output cable
should always be connected Pin 1 of the XLR to ensure that EMC performance and regulations are
met.
1 2
3
Pin 1 Shield
Pin 3 COLD -
Pin 2 HOT +
Output XLR balanced connection

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Using unbalanced connections
Please note that the use of unbalanced connections is not recommended, however, when
connecting the device 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 3 with a short
connection made between pin 1 and pin 3.
2 1
3
HOT +
Shield
Input XLR unbalanced connection
An unbalanced input may be driven by connecting pin-3 ‘cold’ signal to the ground connection of the
unbalanced destination input. The cable shield is connected to pin 1 at the source (this device), and
to ground at the destination device (along with the pin 3 ‘cold’ connection). .Alternatively if the
cable is a single core plus shield, the cable shield should be terminated to both pins 1 and 3.
1 2
3
Shield
HOT +
Output XLR unbalanced connection

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Panel Layouts
D
-12
SIG
AES3
INPUT
+12
CLIP
OdBu
A B
+6
C
INPUT
OUTPUT
A7
NETAUDIO
B C
ONLINE
A B C
AES3AES3
1
+6
OC
23
OC+6 C
O+6 +6
4MUTE 5
O+6
C
LIMIT
SIG
-6dB
OVER C
O
6
+6
AES3
C
OC
O
8
C
AES3
+6 O+6
UTILITY
ENTER
Refresher Flyer Front -02
OVERLAY
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 processor. 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 Utils will escape back to the Home screen.
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.
Input Signal Indicators- A set of five indicators show “Sig”, “-12”, “0dBu”, “+6”and “+12” for each of the DSP inputs
“A” “B” “C” “D”. The signal present Indicators operate at approximately –40 dBu, giving a useful indication of even
relatively low input signal levels. The “0dBu” indicators are intended to show nominal operating level and can also be
useful for setting system gain structure.
Input Clip/mute Indicators - warn the user of input overload and operate at 1dB before clip. The “CLIP” Indicator will
only come on when all other signal lights are illuminated. This indicator also shows a muted input state, and will remain
illuminated at all times whilst mute is active. Input mute is turned on/off in the <INPUT> gain page. This indicator will
also flash regularly if a Module Group has muted this channel.
Graphical Display- When the device is switched on, it will show the Home screen. This provides a useful overview of
channel allocation and Drive Module presets. The screen contrast can be changed by pressing the <UTILITY> button to
navigate to “Screen” and using encoder “A” will change the percentage; this can also optimise the viewing angle. In
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.
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 “NETAUDIO” indicator shows that a
networked digital audio card is installed and routed (Such as Dante™). 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.
Parameter Encoders- Three 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.
AES3 Active Indicators- The “AES3” active indicators show when the AES3 input/output is active for that pair of
channels. AES3 transmits two channels on one XLR cable. Channels 1 and 2 will be carried on connector 1; channels 3
and 4 will be carried on connector 3 and so on.
Mute Buttons- DSP output mute status is indicated and controlled by and illuminated button for each channel. These
flash when the entire unit is muted from the AUX port or from System Engineer Mute-All.
Limiter Indicators- The output indicators shows the status of the limiter and output level relative to the limiter
threshold. The <SIG> indicator shows signal presence and will illuminate when a signal is present in 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. The fourth <+6> indicates a signal 6dB
higher than the limiter threshold. The <+6dB> indicator also refers to the excursion limiter and will illuminate when the
threshold of the excursion limiter has been exceeded. The <˚C> indicator shows that the thermal limiter is active,
protecting against long term thermal stress. Please note that because of the long release time of the thermal limiter,
the <˚C> indicator may remain illuminated for several seconds after signal on that channel is reduced.
Selection Indicators- Each page that is visited when navigating will usually show either one, two or three parameters
labelled “A”, “B” and “C”, each of which can be edited by turning the Encoder associated with that parameter also
labelled “A”, “B” and “C”.

19
NETWORKED
AUDIO
INTERFACE
MAINS 100-230V 50-60Hz 30W
THIS UNIT MUST BE EARTHED ETHER
NET AUX
PORT
76OUTPUTS
5432 1 INPUTS
4AES3 3&4
32AES3 1&2
1
Refresher Flyer Rear -02
AES3 1&2AES3 3&4AES3 5&6AES3 7&8
X Y
Ethernet Communications Port- The device may be controlled entirely from another control source, typically a
Personal Computer, running an application that is compliant with the ObCom standard such as System Engineer, or by
using the simple Tipi protocol. This port is also used for updating the firmware in the unit.
Auxiliary Port- The auxiliary port may be configured to recall snapshots or apply muting.
Networked Audio Ports- The ASC-48 has the option for networked audio ports; if none are required a blanking plate
will be fitted. There are several options for networked audio including Dante™. For a full list please consult your
vendor.
Power Inlet- The Linea Research ASC-48 unit should be connected to a suitable mains electricity supply using an
earthed IEC C14 connection power lead. The processor has a switch mode power supply that is capable of operating
with a nominal mains voltage of 85V to 240V, 50/60Hz without re-configuration.
NOTE: The ASC-48 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.
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. When AES3 operation is selected on an input pair, the Odd channel connector is used
for both channels (e.g. Input 1 is used for channels 1 and 2).
Audio Output Connectors- The processed outputs are impedance balanced, and wired: pin-1 directly bonded to
ground (as required by the AES48 standard), pin-2 hot and pin-3 cold. When AES3 operation is selected on an output
pair, the Odd channel connector is used for both channels (e.g. Input 1 is used for channels 1 and 2).

20
Operation
Starting up the unit
The unit will power up as soon as power is applied to the IEC power inlet; there is no power switch.
When power is present the unit will go through its start-up cycle - first all the indicators will
illuminate then go off, while the screen displays the boot loader information. Next the screen will
display the application firmware information, and all the mute buttons will illuminate. The display
will then show the Home screen indicating drive module configurations; the mutes will then return
to the state they were in when the unit was powered off.
Overview of Modules, Presets Components and Snapshots
A Drive Module represents a loudspeaker subsystem (e.g. Sub and Composite), and comprises one
input channel and a number of output channels, associated with one-another by routing. The size of
the Drive module is determined by the number of outputs in it. The device may contain up to four
Modules.
DSP Input A
Output 1
Output 2
A Module Preset is a collection of settings (parameters) for a Drive Module of a particular size. The
Preset contains a set of parameters for one input and a set of parameters for each of the outputs in
the module. When a Module Preset is recalled, it will automatically change the routing between
Input DSPs and Outputs, consuming a number of outputs according to the size of the Drive Module.
Recalling a Module Preset thus always creates a Drive Module with consecutive outputs.
Input
component
parameters
Output
component
parameters
Output
component
parameters
A Component is a collection of settings (parameters) for one (input or output) channel. Any one of
the output components in a Module Preset may be recalled to any individual output.