Lambda Labs KW-18 User manual
KW-18 Amplifier Manual
Version 1.1
KW-18 Amplifier Manual
Version 1.3 05/2020
© 2020 Lambda Labs; All rights reserved
This manual is optimized to save paper and to print 2 pages per DIN A4 sheet.
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
Contents
1. Safety 3
1.1.Declaration of Symbols and Illustrations of this Manual 3
1.2.IMPORTANT GENERAL SAFETY REGULATIONS 4
1.3.EC declaration and conformity 6
2. Preface 7
3. Technical Data Overview 8
4. Introducing KW-18 Amplifier 9
4.1.Introducing KW-18 Amplifier Front Panel 9
4.2.Introducing KW-18 Amplifier Back Panel 10
5. Back Panel /Connection Detailed Description 11
5.1.Power Connection 11
5.2.Loudspeaker Output Connection 12
5.3.Audio Input Connection 13
6. Front Panel Detailed Description 14
6.1.Introducing User Interface 14
6.2.User Interface Detailed Description 15
6.2.1.ON/OFF Switch 15
6.2.2.Phase OK LEDs (Green) 16
6.2.3.Fault LED (Red) 16
6.2.4.Input Signal Attenuators 16
6.2.5.Level Meter LEDs 17
6.3.Dust Filter 18
7. Rack Installation 19
7.1.Front Mount 19
7.2.Rear Mount 20
7.3.Ventilation 20
8. Maintenance 21
8.1.Cleaning 22
9. Dimensions 22
www.lambda-labs.com !1
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
1. Safety
This manual contains essential information on product safety, installation and usage. Read this manual carefully in order to
become familiar with the operation and usage of the product/s. Read this manual carefully BEFORE operating the product/s
for the first time! Read the IMPORTANT GENERAL SAFETY REGULATIONS you can find on the next pages!
•Keep this manual within reach while operating the product/s all the time!
•As a Lambda Labs products rental partner, always attach the appropriate user manuals to the
devices. Should you need additional printed manuals, please order them from Lambda Labs or
download a latest version!
•When reselling the product/s, hand over the manual to the new owner and provide written
documentation about any changes of the system which may have been applied!
•Always use the latest manual edition! Check our website regularly for updates!
While all information in this manual has been prepared to the best knowledge and with the utmost care, Lambda Labs can not
guarantee the accuracy of the documentation in all cases. Lambda Labs disclaims any liability for any errors or omissions that
may be inferred from this manual or the products described therein. This does not apply to intent and gross negligence.
Technical specifications, as well as dimensions, weight and properties do not constitute guaranteed characteristics. Lambda
Labs expressly reserves the right to make changes and modifications in accordance with statutory provisions and to improve
product features.
1.1. Declaration of Symbols and Illustrations of this Manual
In order to point out potential sources of danger and application errors, the following symbols and illustrations are used in
this manual:
www.lambda-labs.com !3
DANGER:
The warning symbol "DANGER" indicates that non-observance may pose adanger to the
operator or to other persons in close range and the amplifier product!
DANGER! RISK OF ELECTRIC SHOCK:
The warning symbol "RISK OF ELECTRIC SHOCK“ indicates that terminals carry electrical
voltage of sufficient magnitude to constitute risk of electric shock!
!
DANGER!
!
Risk of Electric Shock
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
1.2. IMPORTANT GENERAL SAFETY REGULATIONS
www.lambda-labs.com !4
CAUTION:
The warning symbol "CAUTION" requires the operator to take particular precautions to
prevent possible damage to the amplifier product!
ATTENTION:
The warning symbol "ATTENTION" indicates that aspecial attention should be given to
certain setup activities or applications!
NOTE:
This illustration notifies the operator about hints and help to simplify and to accelerate the
use of the amplifier, the setup process or to better understand some contexts.
!
CAUTION!
!
Intended use!
When using the KW-18 amplifier and its accessories, always follow the instructions in this
manual! Non intended use might cause damage in the equipment and risk of electric
shock!Use only attachments/accessories specified by the manufacturer!
No user serviceable parts inside!
Do not remove the top cover or the rear section and do not open the KW-18 power
amplifier unit! No user serviceable parts inside! Servicing should be always performed by
qualified personnel!
Keep away from liquids and moisture!
To reduce the risk of fire or electric shock, do not expose this device to rain and moisture.
The device shall not be exposed to dripping or splashing liquids and no objects filled with
liquids! Do not use this device near water!
Mains Connection!
The device shall always be connected to MAINS sockets outlet with aprotective earthing
(PE) connection.
Grounding!
Do not defeat the safety purpose grounding pin of the power plug. If the provided plug
does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
Maintenance!
Please refer to Chapter 8„Maintenance“. If any damage or failure scenario of the
amplifier occurs, please contact the Lambda Labs technical support and wait for further
instructions! Do NOT repair or exchange components by yourself and without support of a
qualified service personnel!
[
DANGER!
[
DANGER!
[
DANGER!
[
DANGER!
[
DANGER!
[
DANGER!
ATTENTION!
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
www.lambda-labs.com !5
Manual!
Keep this manual within reach while operating the product/s all the time!
As a Lambda Labs products rental partner, always attach the appropriate user manuals to
the devices. Should you need further manuals, please order them from Lambda Labs or
download a current version!
If you resell the system, hand over the manual to the next operator and provide written
records about any changes of the system which may have been applied! Check our website
regularly for updates in order to use always and only the latest manual version!
Cables!
Use only high-quality commercially-available speaker cables. All installations or
modification should be performed by qualified personnel.
Cabling!
Lay down all cables with care. Protect the power cord from being walked on or pinched,
particularly at plugs/receptacles and the point where they exit from the device.
Additionally, secure the cables with duct tape or cable bridges and mark them for safety
reasons. Do not place anything on the cables of the device!
Setup environment!
Keep the device dry and avoid the contact to heavy dust, salt, sand and prolonged
exposure to intense sunlight or strong vibrations and impact.
Placement &interaction with other devices!
The device should not be placed near any heat producing sources or exposed to high
temperatures (above 40 degrees Celcius) or temperatures below zero degrees Celcius.
Unplug this device during lightning storms or when unused for long periods of time!
Sufficient ventilation should be provided when operating the amplifier! Do not block any
ventilation openings. Install in accordance with the manufacturer's instructions!
Storing!
Store the device in adry, cool and clean environment!
Neutrik PowerCON!
Neutrik PowerCON is aconnector without breaking capacity, therefore the powerCON
should not be connected or disconnected under load or live!
Neutrik SpeakON!
Neutrik SpeakON is aconnector without breaking capacity, therefore the SpeakON should
not be connected or disconnected under load or live!
Shipping
Keep the packaging of the device in order to send it in original packaging in case of a
fault. This minimizes the risk of possible transport damage.
[
DANGER!
[
ATTENTION!
[
CAUTION!
[
CAUTION!
[
CAUTION!
[
CAUTION!
[
[
CAUTION!
!
ATTENTION!
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
1.3. EC declaration and conformity
Lambda Labs
Austria
Declares that the following product:
KW-18
Is in conformity with the provisions of EMC standards and product category:
-Emission:
-EN 55032:2012 with EN 55032:2012 AC 2013
-EN 61000-3-2:2014
-EN 61000-3-3:2013
-FCC Part 15 Sub B
Immunity:
EN55103-2:2009
Product Category:
EN55103 E-2
Special local EMC compliance regulation may apply!
SAFETY COMPLIANCE:
Safety Class I
The unit must be grounded to the PE of the Power Network thru the Power connectors! In the case of an Off-Grid
use, a proper grounding network must be provided to the PE pins of the Power input connectors of the unit! PE
impedance should be always kept low! The use of a GFCI unit is recommended! In the case of single phase power
line application, use a common single phase GFCI! In the case of three phase power line application, use a single
3-phase GFCI! Special local electrical safety compliance regulation may apply!
WEEE Declaration (Disposal)
Electrical and electronic devices must be disposed of separately from household or municipal waste at the end of its operational
lifetime. Please dispose of this product according to the respective national regulations or contractual agreements. If there are any
further questions regarding the disposal of this product, please contact Lambda Labs.
www.lambda-labs.com !6
Graz, 17/02/2020
Steffen Kroschel, Chief Technology Officer (CTO)
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
2. Preface
Dear Lambda Labs User,
thank you for purchasing the Lambda Labs professional power amplifier KW-18. The KW-18 is avery high power and very
high quality professional power amplifier. Lambda Labs recommends the use of KW-18 for the non self-powered Lambda Labs
loudspeakers with the factory presets provided by Lambda Labs. For more information about the factory presets please refer
to the User Manual of the particular product or the Lambda Labs Presets Reference Guide!
The main features of the KW-18 amplifier:
•Extreme output power capability, thanks to the 32kW peak power 3 phase regulated SMPS
•Wide bandwith, high frequency switching amplifier with high reactive current for high end sound
• High damping factor even at 20kHz
•Full power, even when all channels driven with low frequency signal
•Very low, frequency independent distortion
•Extremely low output noise
•Ideal choice for all sound professionals looking for an all in one very high power, reference quality amplifier for a very wide
range of applications without sonic tradeoffs
•Very detailed, and precise high frequency sound reproduction
•Extremely powerful low frequency sound reproduction
•Very musical, warm, but precise midrange sound reproduction
•Spectacular 3D stereo imaging
• Flexible AC power options: either single, dual or three phase operation is possible without any power limitations
•Ideal for touring, fixed installation, cinema, and high-end studio applications
• Built in DSP option coming soon…
www.lambda-labs.com !7
KW-18 Amprack
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
3. Technical Data Overview
www.lambda-labs.com !8
Output Power
(All Channels Driven)
16 Ohms: 4 x 1200 Watts
Output Power
(All Channels Driven)
8 Ohms: 4 x 2300 Watts
Output Power
(All Channels Driven)
4 Ohms: 4 x 4500 Watts
Output Power
(All Channels Driven)
3 Ohms: 4 x 4000 Watts
Frequency Response
10 – 50,000Hz (+0/- 3dB)
Voltage Gain
30 dB
Damping Factor
(@1kHz/8Ohms)
800
Signal to Noise Ratio
(A-weighted)
128 dB(A)
Input Impedance
(Symmetrical)
10kOhms ( 2 0 k O h m s * )
THD+N
(20Hz-20kHz typ. @1/2 Power)
0,02"%
Minimum Load Impedance
2 Ohms / Channel
Display
AC Input OK, Error, Limit -3dB, -6dB, -12dB & Signal LED
Protection Circuitry
Overvoltage protection, Undervoltage protection, Overcurrent
protection (both Peak and RMS), Short Circuit protection, Output DC
protection, Overtemperature protection, Voltage Clip Limiter, RMS
Current Limiter, Peak Current Limiter
AC Power Voltage Range
3 x 90Vac - 3 x 255Vac
Current Draw
3x8 A RMS @230Vac (1/8 Power)
Dimensions
483mm x 584mm x 89mm
Weight
39,7 lbs (18 kg)
*Input Impedance depends on the channel input signal attenuator position! For more details please refer
to Chapter 3.1 Input Connections!
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
4. Introducing KW-18 Amplifier
4.1. Introducing KW-18 Amplifier Front Panel
4.1 Figure 1: Front Panel Overview (Delivery Sate)
www.lambda-labs.com !9
a)
b)
b)
c)
c)
d)
d)
PART
DESCRIPTION of 4.1 Figure 1
REFERENCE
a)
User Interface
The KW-18 Front Panel contains the centrally placed User Interface. The User
Interface provides the Control Displays showing the status of the amplifier, the
Input Signal Attenuators (Input Level Knob), the Limiter LEDs and the On/Off
Switch.
Chapter 6.1
Chapter 6.2
b)
Dust Filter Foam
To keep the inside of the amplifier as clean as possible, the cooling air is filtered
through aDust Filter Foam. This filter can be easily removed for cleaning.
Chapter 6.3
c)
Carrying Handle
Handles to carry or hold the amplifier during arack mounting procedure.
_
d)
Mounting Holes
Use standard 6mm rack screws with plastic washers to mount the amplifier in a
19“ standard rack.
_
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
4.2. Introducing KW-18 Amplifier Back Panel
4.2 Figure 1: Back Panel Overview (Delivery Sate)
www.lambda-labs.com !10
PART
DESCRIPTION of 4.2 Figure 1
REFERENCE
a)
Power Connection
The KW-18 provides 3x20 Ampere Neutrik PowerCON Connectors to power the
KW-18 amplifier. To ensure the full output power capability, the amplifier needs
to run with all 3connectors connected and powered using 16A Type "C" Circuit
Breakers. In the case of lower power use it could be operated however using only
two of the Neutrik Powercon connectors and as such, powered from only 2x 16A
Type "C" Circuit Breakers.
NOTE: The Unit can not start when only one of the Powercon connectors is used!
NOTE: The KW-18 can only work from voltages of 90V AC –255V AC 50-60Hz!
Operation from DC Voltage is not possible! An input voltage higher than 255V
AC RMS is not permitted and might cause damage to the KW-18!
Chapter 5.1
b)
Loudspeaker Output Connection
The KW-18 provides 4xNeutrik SpeakON NL4 type Connectors to power the
corresponding loudspeakers. All 4connectors use +1 as „+“ and -1 as „-“ output
for the corresponding channel.
NOTE: +2 and -2 pins are not used! The Loudspeaker connectors used on KW-18
are fully compatible with both Neutrik Speakon NL4 and NL2 type plugs!
Chapter 5.2
c)
Audio Input Connection
The KW-18 provides 4xstandard XLR 3pin connectors to connect an audio
signal. KW-18 uses the new international standard Pinout for the XLR connectors:
The symmetrical audio inputs have 10kOhm impedance, when the channel input
signal attenuator (input level knob) is at its minimum position (counter-clockwise).
The input impedance with the attenuator at its maximum position (clockwise) is
20kOhms.!
Chapter 5.3
d)
Ethernet Connection
The KW-18 provides IN/OUT Ethernet connectors, reserved for the upcoming built-
in DSP. Currently not used.
_
a)
b)
c)
d)
Pin1: Shield Pin2: signal +(hot) Pin3: Signal- (cold)
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
5. Back Panel /Connection Detailed Description
5.1. Power Connection
KW-18 uses three pieces of 20A Neutrik PowerCON Connectors to provide enough input power for its extreme output power
capability. Use the provided Power cable or any (3 x1.5mm2 for max cable length of 1.5m or 3x 2.5mm2 for acable length
up to 10m) power cable equipped with Neutrik PowerCON connector!
Always use power with Protective Earth (PE) having asufficiently low impedance! Use 16A Type „C” Circuit Breakers for
230V operation!
The unit must be grounded to the PE of the Power Network thru all three Power connectors! In the case of an Off-
Grid use (for example using aPower Generator), aproper grounding network must be provided to the PE pins of the Power
input connectors of the unit!
PE impedance should be always kept low! The use of aGFCI unit is recommended! In the case of single phase power line
application, use acommon single phase GFCI! In the case of three phase power line application, use asingle three-phase
GFCI!
NOTE: Special local electrical safety compliance regulation may apply!
KW-18 might be used from asingle, two or even 3phase power! In every case, all three Neutrik PowerCON Connector
has to carry Phase, Neutral, and PE! Amissing Neutral line might cause damage to the KW-18!
To ensure the full output power capability, the amplifier needs to run with all 3connectors connected and powered using
16A Type "C" Circuit Breakers. In the case of lower power use it could be operated however using only two of the Neutrik
Powercon connectors and as such, powered from only 2x 16A Type "C" Circuit Breakers.
NOTE:The Unit can not start when only one of the Powercon connectors is used!
NOTE:The KW-18 can only work from voltages of 90V AC –255V AC 50-60Hz! Operation from DC Voltage is not possible!
An input voltage higher than 255V AC RMS is not permitted and might cause damage to the KW-18!
In the case of 110V power line we strongly recommend the use of „Delta” circuit –meaning, that each Neutrik PowerCON
Connector carries two Phase and one PE line (in this special case Neutral Line is not used!). This would give 190V effective
AC for all of the three Power Inputs on the KW-18. For this operation we recommend 20A Type „C” Circuit Breakers!
Using the KW-18 from single, two or three phase 110Vac Line(s) with 20A Type „C” Circuit Breakers could limit the
maximum achievable output power! All of our guidelines for using additional GFCI applies also for all types of 110V AC
operations!
NOTE: Special local electrical safety compliance regulation may apply!
www.lambda-labs.com !11
5.1 Figure 1: Power Connectors
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
5.2. Loudspeaker Output Connection
Loudspeaker output connectors are of Neutrik SpeakON NL4 type. All 4connectors use +1 as +and -1 as –output for the
corresponding channel. The +2 and -2 pins are not used!
www.lambda-labs.com !12
Danger: Do not defeat the safety purpose Grounding Pin of the power plug! If the provided plug does
not fit into your outlet, consult an electrician for replacement of the obsolete outlet! Always use power
with Protective Earth (PE) having asufficiently low impedance! Use 16A Type „C” Circuit Breakers for
230V operation!
Danger: Always use cables and Power Distribution Units made by and/or checked by qualified
electricians! RISK OF ELECTRIC SHOCK! RISK OF EQUIPMENT DAMAGE!
Attention: KW-18 always needs power from all three Powercon Connectors to work properly! In the
case of lower power use it could be operated however using only two of the Neutrik PowercoCON
connectors. The Unit can not start when only one of the PowerCON connectors is used!
Attention: The KW-18 can only work from voltages of 90V AC –255V AC 50-60Hz! Operation from
DC Voltage is not possible! An input voltage higher than 255V AC RMS is not permitted and
might cause damage to the KW-18!
Attention: Always use Power Cables with double isolation, and with isolation material allowed for the
particular use! Please always refer to the local regulations!
Attention: Neutrik PowerCON is aconnector without breaking capacity, therefore the PowerCON
should not be connected or disconnected under load or live!
[
DANGER!
[
ATTENTION!
[
ATTENTION!
[
ATTENTION!
[
DANGER!
[
ATTENTION!
5.2 Figure 1: Loudspeaker Output Connection
Danger! RISK OF ELECTRIC SHOCK: Terminals marked with this symbol carry electrical voltage of
sufficient magnitude to constitute risk of electric shock!
[
Risk of Electric Shock
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
5.3. Audio Input Connection
Audio input signal can be applied to the KW-18 using standard XLR 3pin connectors. Lambda Labs recommends the use of
Neutrik gold plated XLR plugs or Switchcraft XLR connectors (tin plated)! The use of silver or silver plated pin XLR
connectors is NOT recommended!
KW-18 uses the new international standard Pinout for the XLR connectors:
www.lambda-labs.com !13
Danger: Loudspeaker Outputs can carry dangerously high output voltages! RISK OF ELECTRIC
SHOCK!
Attention: The +2 and -2 pins are not used! The Loudspeaker connectors used on KW-18 are fully
compatible with both Neutrik SpeakON NL4 and NL2 type plugs!
Attention: Neutrik SpeakON is aconnector without breaking capacity, therefore the SpeakON should
not be connected or disconnected under load or live!
Attention: Always use Loudspeaker Cables with sufficient wire gauge! 2x2.5mm2 is recommended
only for lengths below 10m! 2x4mm2 Cables are recommended above 10m length up to 25m!
Attention: Always use Loudspeaker Cables with double isolation, and with isolation material allowed
for the particular use! Please always refer to the local regulations!
[
DANGER!
[
ATTENTION!
[
ATTENTION!
[
ATTENTION!
[
ATTENTION!
5.3 Figure 1: Loudspeaker Output Connection
PIN
Assignment (Balanced)
1
Ground
2
Signal +(hot)
3
Signal -(cold)
1
2
3
Female
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
The symmetrical audio inputs have 10kOhm impedance, when the channel Input Signal Attenuator (Input Level Knob) is at its
minimum position (counter-clockwise). The input impedance with the attenuator at its maximum position (clockwise) is
20kOhms.!
Usual drive capacity of DSP units on the market is 600 Ohms. Daisy chaining more inputs (and/or more KW-18 units) is
limited therefore to 16 inputs altogether (625 Ohms) with the input signal attenuators at their minimum positions. With all
attenuators at their maximum position, the number of inputs driven in parallel (daisy chained) could be as high as 32!Voltage
gain of the KW-18 power amplifier is 30dB with the Input Signal Attenuator at its maximum position.
6. Front Panel Detailed Description
6.1. Introducing User Interface
www.lambda-labs.com !14
Danger: Always design your grounding scheme before connecting input signal to the unit! Ground loop
could damage the equipment! As arule of thumb, in problematic cases one should remove the shield of
the signal cable only on the receiver unit’s side! Do never defeat the safety purpose grounding pin of
the power plug!
Caution: XLR audio shield pins are directly connected to the housing of the unit and to the power input
PE pins!
[
DANGER!
[
CAUTION!
6.1 Figure 1: User Interface Overview
a)
b)
c)
d)
e)
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
6.2. User Interface Detailed Description
6.2.1. ON/OFF Switch
You can switch the KW-18 power amplifier on and off using this front panel switch. If the unit is switched on, the white ring
on the ON/OFF Switch will be illuminated!
www.lambda-labs.com !15
PART
DESCRIPTION of 6.1 Figure 1
REFERENCE
a)
ON/OFF Switch
ON/OFF Switch to switch the amplifier on and off. Push the button inwards to
switch the amplifier on and off.
Chapter 6.2.1
b)
Phase OK LEDs
Status indicators, indicating that (correct) voltage is applied to the connector.
Chapter 6.2.2
c)
Fault LED
Status indicator, indicating afunction fault.
Chapter 6.2.3
d)
Input Signal Attenuators
Rotary control to adjust the signal level for the respective channel.
Chapter 6.2.4
e)
Level Meter LEDs
Status indicators, indicating signal levels and limits.
Chapter 6.2.5
Caution: Always check the „Phase OK” and the „Fault” LEDs status when switching the unit on! If one
or more „Phase OK” LEDs are not illuminated, please check the power connection, and the
corresponding power input’s voltage! For more information please refer to Chapter 5.1 Power
Connection section of this manual!
Attention: Neutrik PowerCON is aconnector without breaking capacity, therefore the PowerCON
should not be connected or disconnected under load or live!
Attention: Independent from the ON/OFF Switch’s status, the unit will not switch on when there is not
at least two power input used with the correct voltage or if there is afault in the KW-18 unit. In the
case of afault, the „Fault” LED is illuminated!
[
CAUTION!
[
ATTENTION!
[
ATTENTION!
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
6.2.2. Phase OK LEDs (Green)
Lites up when there is power availabe on the corresponding power input and the voltage is in the normal range. For more
information please refer to the Chapter 5.1 Power Connection section of this manual!
6.2.3. Fault LED (Red)
Lites up when there is afault in the KW-18 power amplifier unit. In the case of fault please contact Lambda Labs or alocal
Lambda Labs sales partner!
6.2.4. Input Signal Attenuators
The four input signal attenuators can be used to attenuate the signal for the corresponding channel of the KW-18 power
amplifier unit.
www.lambda-labs.com !16
Danger: Do not remove the top cover (or the rear section) and do not open the KW-18 power amplifier
unit! No user serviceable parts inside! Servicing should be always performed by qualified personnel!
Danger: Do not use or switch on afaulty KW-18 unit and do not apply voltage to the power input
connectors in the case of afault!
Attention: In the case of afault, please note the „Phase OK” and the „Fault” LEDs status, as this
could ease the diagnostics when you contact Lambda Labs or asales partner!
[
DANGER!
[
ATTENTION!
[
DANGER!
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
6.2.5. Level Meter LEDs
www.lambda-labs.com !17
Attention: In the minimum position (fully counter-clockwise), anearly infinite attenuation is provided.
In this case, the input impedance of the corresponding channel is 10kOhms.
Attention: In the maximum position (fully clockwise), no attenuation is provided and the voltage gain
of the corresponding channel is 30dB. In this case, the input impedance of the corresponding channel is
20kOhms.
[
ATTENTION!
[
ATTENTION!
LEDs
Meaning
Limit LED (Red)
Lites up when either of the following scenarios occour:
-Peak voltage limiting
-Peak Current limiting
-RMS Current limiting
-3dB LED (Yellow)
Lites up when the input signal of the channel reaches 3dB below CLIP level
-6dB LED (Green)
Lites up when the input signal of the channel reaches 6dB below CLIP level
-12dB LED (Green)
Lites up when the input signal of the channel reaches 12dB below CLIP level
Signal present LED (Green)
Lites up when the input signal of the channel reaches 50dB below CLIP level
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
6.3. Dust Filter
Dust filter foam could be saturated and blocked by dust and dirt. In such acase the cooling of the amplifier will get strongly
limited. Therefore regular cleaning of the dust filter is mandatory for proper use! Check the filter foam after every use! If
needed, clean it with water!
www.lambda-labs.com !18
Danger: Reinsert the filter foam only after it is dry!
Danger: Do not use the amplifier without adust filter!
Attention: Using hazer and/or fog machine fluid can cause avery fast saturation/blockage of the
amplifier dust filter foam! In such cases, Lambda Labs recommend checking/cleaning the dust filter on a
daily basis!
Attention: Having reserve dust filter foam is also recommended. Filter foams could be purchased from
Lambda Labs directly or from local sales partners.
[
DANGER!
[
ATTENTION!
[
ATTENTION!
[
DANGER!
Lambda Labs - Professional Acoustics KW-18 Amplifier Manual
7. Rack Installation
7.1. Front Mount
The KW-18 professional power amplifier can be mounted into astandard 19” rack case. The dimensions (mm) for the rack
mounting is depicted on the drawings above.
www.lambda-labs.com !19
483
468
462
76,2
Danger: You should always use all 4screws for the front mount in a19” rack! Use standard 6mm rack
screws to mount the amplifier!
Caution: Use always rack-screws equipped with plastic washer to avoid damage of the KW-18
surface!
Attention: Lambda Labs recommend the use of shock mount rack rail equipped 19” racks for heavy-
duty touring usage!
Attention: The 19” rack should have sufficient total inside depth in order to avoid damage of the
cables/connectors plugged in to the KW-18 amplifier unit! Lambda Labs recommend racks with a
minimum total inside depth of 645 mm!
[
DANGER!
[
ATTENTION!
[
ATTENTION!
[
CAUTION!
88,8
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1
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