Lab.gruppen C Series C 16 4, C Series C 28 4, C Series C 48 4, C Series C 68 4, C 68:4 Operation Manual
...
Rev. 2.0.3
Operation Manual
C Series:
Dedicated Installation Amplifiers
• C 68:4
• C 48:4
• C 28:4
• C 16:4
Item no. OM-CS
C Series C 68:4 , C 48:4, C 28 :4 and C 16:4 Operation Manual 3
2 C Series C 68:4 , C 48:4, C 28 :4 and C 16:4 Operation Manual
1 CONTENTS .................................................................................................................................................2
2
APPROVALS ................................................................................................................................................4
3 WARNINGS .................................................................................................................................................4
3.1 Explanation of graphical symbols ........................................................................................................4
3.1.1 WARNING ................................................................................................................................4
3.1. 2 CAUTION ..................................................................................................................................4
3.2 Important Safety Instructions ..............................................................................................................4
3.3 User responsibility ...............................................................................................................................5
3.3.1 Mains connection grounding ....................................................................................................5
3.3.2 Speaker output hazard ..............................................................................................................5
3.3.3 Radio interference ....................................................................................................................5
3.3.4 Speaker damage .......................................................................................................................5
3.3.5 Maintenance .............................................................................................................................5
4
WELCOME ...................................................................................................................................................6
4.1 Introduction ..........................................................................................................................................6
4.2 Main Features ......................................................................................................................................6
4.2.1 Class TD amplifier and regulated switch-mode p ower supply ................................................. 6
4.2.2 Amplifier gain ...........................................................................................................................6
4.2.3 Voltage Peak Limiter (VPL) .......................................................................................................7
4.2.4 Protection and performance optimization .................................................................................7
4.2.5 NomadLink / Ethernet control and monitoring network ...........................................................7
5 INSTALLATION ...........................................................................................................................................8
5.1 Unpacking ............................................................................................................................................8
5.2 Mounting .............................................................................................................................................8
5.3 Cooling .................................................................................................................................................8
5.4 Operating voltage ................................................................................................................................8
5.5 Grounding ............................................................................................................................................9
6 QUICK GUIDE OVERVIEW .......................................................................................................................10
6.1 Front-Panel overview .........................................................................................................................10
6.1.1 Power on/off and remote switch ............................................................................................10
6.1.2 Front Panel LED’s ...................................................................................................................10
6.2 Rear-Panel overview ..........................................................................................................................11
6.2.1 The DIP-switch features .........................................................................................................11
6.3 NomadLink / Ethernet network setup ................................................................................................12
7 OPERATION AND PERFORM ANCE ........................................................................................................14
7.1 Introduction ........................................................................................................................................14
7.2 Operation precautions .......................................................................................................................14
7.3 Signal flow and headroom .................................................................................................................14
7.3.1 Signal flow blocks ...................................................................................................................14
7.3.2 Headroom, sensitivity and VPL / Gain settings ......................................................................15
7.4 Audio Input and Output connections, setup and features .................................................................16
7.4.1 Balanced / Unbalanced Input connection ...............................................................................16
7.4.2 Output operation and connection ...........................................................................................16
7.4.3 Output bridge mode ...............................................................................................................16
7.4.4 Amplifier Gain .........................................................................................................................17
7.4.4.1 Channel gain / Level (front-panel pots) .......................................................................... 17
7.4.4.2 Amplifier sensitivity ....................................................................................................... 17
7.4.5 Output Voltage Peak Limiter (VPL) .........................................................................................17
7.4.6 Constant Voltage 70 V and 100 V systems setup and operation ............................................ 18
7.4.7 Current Peak Limiter, (CPL) ....................................................................................................18
7.5 Protection, faults and warnings .........................................................................................................18
7.5.1 Int roduction ............................................................................................................................18
7.5.2 Safe Operating Area Detector (SOAD ) ...................................................................................18
7.5.3 Very High Frequency (VHF ) protection ...................................................................................18
7.5.4 DC protection .........................................................................................................................19
7.5.5 High-impedance war ning (open load) ....................................................................................19
7.5.6 Low-impedance protection (shor t circuit) ...............................................................................19
7.5.7 Temperature protection ..........................................................................................................20
7.5.8 Power Average Limiter (PAL) .................................................................................................20
7.5.9 Soft Start ................................................................................................................................20
7.6 Front-panel monitoring and adjustments ...........................................................................................21
7.6.1 Level indicators .......................................................................................................................21
7.6.2 Level adjust ............................................................................................................................21
7.6.3 Mute indication .......................................................................................................................21
7.6.4 Performance, Warning and Fault indicators ............................................................................22
7.7 NomadLink network and DeviceControl Software ............................................................................23
7.7.1 NomadLink network in the amplifiers ....................................................................................23
7.7. 2 Connection and setup .............................................................................................................23
7.7. 3 NomadLink network cable lengths .........................................................................................24
7.7. 4 Ethernet network cable lengths .............................................................................................25
7.7. 5 DeviceControl software .......................................................................................................... 25
8 APPENDIX .................................................................................................................................................26
8.1 M ai nte na nce ......................................................................................................................................26
8.2 FAQ ....................................................................................................................................................26
8.3 Additional documentation ..................................................................................................................27
8.4 Current Draw and Thermal Dissipation specifications .......................................................................28
9 TECHNICAL SPECIF ICATIONS ................................................................................................................30
10 WARRANTY ..............................................................................................................................................31
1 CONTENTs CONTENTs 1
C Series C 68:4 , C 48:4, C 28 :4 and C 16:4 Operation Manual 5
4 C Series C 68:4 , C 48:4, C 28 :4 and C 16:4 Operation Manual
This equipment co nforms to the requirements of the EMC d irective 89/ 336/EE C, amended by 92/ 31/EEC and 93/ 68/ EEC and the
requirements of the Low Vol tage Directive 73/ 23/EEC , amended by 93/ 68/EEC .
Standards appli ed: EMC Emission EN5 5103-1, E3
EMC Immunity EN 55103-2, E3, with S /N below 1% at normal ope ration level.
Electrical Safet y EN6006 5, Class I
This equipment is tes ted and approved according to th e U.S. safety standard AN SI/ UL 600 65 and Canadian safety s tandard CSA
C22.2 NO. 6 0065. ETL ma de the tests and they are a National ly Recognized Testing Labora tory (NRTL) .
3.1 Explanation of graphical symbols
The lightning symb ol within a triangle is intende d to alert the user to the presence of u n-insulated “dange rous voltage” within the amplifi er’s
enclosure that may be of s ufficient magnitude to co nstitute a risk of electric shoc k to humans.
The exclamation po int within a triangle is intended to a lert the user to presence of impo rtant operating and ser vice instructions in the li terature
accompanying th e product.
3.1.1 WARNING 3.1.2 CAUTION
3.2 Impor tant Safety Instructions
Before using your ampli fier, be sure to carefully read the appli cable items of these operatin g instructions and the safet y suggestions
Ke ep this manual for future reference. 1.
H eed all warnings. 2.
F ollow all instructions. 3.
D o not use this unit near water. 4.
D o not spill water or other liquids into o r on the unit. Do not operate the amp lifier while wet or standing in li quid. 5.
C lean only with dry cloth.6.
D o not block the air intake or exhaust p orts. Install the unit in ac cordance with the instruc tions. 7.
D o not operate the amplifier near heat pro ducing devices such as radi ators, heat regi sters, stoves or other apparatus that produce heat. Always 8.
operate the unit with the chassis grou nd wire connected to the electrical safety ea rth. Do not defeat the safety purpose of a grounding -type plug. A
grounding typ e plug has two pins and a third groundi ng prong. The third prong is provid ed for your safety. If the provided plug d oes not fit into your
outlet, consult an el ectrician for replaceme nt of the obsolete outlet.
C onnect only to AC power outlets r ated 100-120 V or 200 -240 V, 50-6 0 Hz.9.
Do not use this amplifier if the power cord is broken or frayed. Protect the power cord from being walked upon or pinched particularly at the plugs 10.
and the point where it exi ts from the apparatus.
Only use accesso ries specified by the manufa cturer. 11.
The unit is intended to use in a 19” rack. Follow the mounting instructions. When a rack on wheels is used, use caution when moving the loaded 12.
rack to avoid injury fr om tipping over.
Unplug this appar atus during lightning storms or w hen unused for long periods of t ime. 13.
Do not connect an amplifier output in parallel or series with any other amplifier’s output. Do not connect the amplifier output to any other voltage 14.
source, such as bat tery, mains source, or power suppl y, regardless of whether the ampli fier is turned on or off.
Do not run the output of a ny amplifier back into another ch annel’s input.15.
Refer all servicin g to qualified service pe rsonnel. Servicing is re quired when the apparatus ha s been damaged in any way such as :16.
Power-supply co rd or plug is damaged. •
Liquid has been sp illed into the unit•
An object has fall en into the unit•
The unit has been exp osed to rain or moisture•
The unit does not op erate normally•
The unit was droppe d or the enclosure is damaged•
17. Do not remove top or bottom covers . Removal of the covers will expose h azardous voltages. The re are no user serviceable p arts inside and
removal may void the warranty.
18. An experienced user shal l always supervise this profe ssional audio equipment, e specially if inexperienc ed adults or minors are using th
equipment.
19. The mains plug is used as the dis connect device and shall rem ain readily operable. If the a mplifier mains plug is not read ily accessible
due to mounting in a 19” rack, then the mains plu g for the entire rack must be readily o perable.
20. The US National Differe ncescl.16.3 requires that Noma dLinknetwork cables mu st be flame rated VW-1.
2 A PPROVAL s WARNINGs 3
3.3 User responsibility
3.3.1 Mains co nnection groundi ng
Your amplifier must be connected to a
grounded socket outlet.
3.3.2 Speaker o utput hazard
Power amplifi ers are capable of producing
hazardous output voltages. To avoid electrical
shock, do not touch any exposed speaker wiring
while the amplifier is operating. The external wiring
connected to the speaker terminals shall be installed
by a trained and qualifi ed person, or ready-made
leads or cords of appropriate c apacity shall be
used.
3.3.3 Radio in terference
As the amplifier outputs produce high voltage,do
not connect or disconnect speaker cables when
the mains power is on. Also, attach the safety cover
on the speaker terminals for safe operation and to
comply with electrical product approvals.
A sample of this product has b een tested and complies
with the limits for the European Electro Magnetic
Compatibility ( EMC) directive. This equipment has
also 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
from electrical equipment. This product uses radio
frequency energy and if not used or installed in
accordance with these operating instructions, may
cause interference to other equipment, such as radio
receivers. 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 on and off, the user
is encouraged to try to correct the interference by
one or more of the following measures:
Reorient or relocate the antenna.•
Increase the separation between the equip-
•
ment and receiver.
Connect the equipment into an outlet on a •
circuit different from that to which the receiver is
connected .
Check if the affected unit complies with the •
EMC limits for immunity, (CE -labeled). If not,
address the p roblem with the m anufacturer or
supplier. All electrical products sold in the EC must
be approved for immunity against electromagnetic fields, high voltage flashes, and radio interference.
Consult the dealer or an experienced radio/•
TV technician for help.
3.3.4 Speaker d amage
Your amplifier is very power ful and can be
potentially dangerous to both loudspeakers and
humans alike. Many loudspeakers can be easily
damaged or destroyed by overpowering, especially
with the high power available from a bridg ed
amplifier.
Always check the speaker’s continuous and peak
power capabilities.
Even if though the amplifier’s front-panel attenuators
can be used to reduce the gain, it is still possible to
reach full output power if the input signal level is
high enough.
3.3.5 Mainte nance
Fo r saf e an d rel iab le o pera tio n, t he du st c over s be hin d
the front panel as well as the inside of the amplifier
should be cleaned regularly. If the dust filters and
inside are not maintained there will be safety risks.
For example the amplifier can ignite the dust and
a fire will occur due to high internal temperatures.
There is also a risk that the amplifier will malfunction
since the amplifier is dependent of constant airflow
from front to rear. If the dust filters are not clean and
the amplifier malfunctions, any resultant problems
will not be covered by the warranty.
To reduce risk of fire or electr ic shock, do not expose this
apparatus to rain or mo isture.
To reduce the risk of fire or elect ric shock, do not remove
screws. No user-se rviceable parts i nside. Refer servicing to
qualified ser vice personnel
3 WARNINGs
C Series C 68:4 , C 48:4, C 28 :4 and C 16:4 Operation Manual 7
6 C Series C 68:4 , C 48:4, C 28 :4 and C 16:4 Operation Manual
4 WELCOME
4.1 Introduction
Thank you for choosing Lab.gruppen C Series power
amplifiers for your sound reinforcement system
installation. We are confident that you will be
very pleased with the performance, configuration
flexibility, reliability, and long-term durability offered
by the C Series products.
This manual provides a comprehensive guide to the
features and functionality of C Series model C 68:4,
C 48 :4, C 28: 4 and C 16: 4 amplifiers. Please read
through it in its entirely to bec ome fully acquainted
with the many configuration options and multiple
layers of protection circuitry.
To fa cil itat e ti mely ins tall ati on an d us e of t his C Ser ies
product, we have included a Quick Guide Overview
(section 6). This brief summary, in conjunction with
Installation (section 5), contains the basic information
needed to safely install the amplifier and place it in
service. However, we highly recommend reading
through this manual in its entirety, beginning with
Main Features and Technologies and continuing
through Operation and Performance. As you become
thoroughly familiar with all aspects of operation, you
may learn of features or options that will affect your
choices on amplifier modes or loudspeaker system
configuration.
Lab.gruppen C Series power amplifiers are designed
and built specifically for the unique demands of
permanent installation applications. C Series
amplifiers offer the optimum combination of highquality audio reproduction, flexible features, ease of
installation, and 100% reliability in normal use.
By packing four or eight channels of reconfigurable
power amplification into a 2U chassis, the C Series
achieves unprecedented “power and channel density.” The benefits of compact dimensions include
reduced rack space requirements and minimal heat
build-up. The flexible output stages enable each
amplifier channel to be set for either low impedance
or c ons tant vol tag e (7 0 V / 1 00 V ) mo de. Nom adLi nk,
an easy-to-use network for monitoring and control,
is implemented as a standard feature on all C Series
amplifiers.
Although C Series features and facilities are tailored
to installation applications, at the heart of each
amplifier is the same advanced technology that has
made Lab.gruppen the benchmark of quality for touring
concert systems: exceptional sonic performance,
rugged construction, proven reliability, and protection
features that anticipate every unwelcome possibility.
This manual is shipped with C Series amplifier models C 6 8:4, C 48: 4, C 28:4 and C
16:4. All references to “C Series” in this
manual apply to all four of these models.
A different manual is shipped with models C 20:8X,
C 10 :8 X, C 10: 4X a nd C 5: 4X. Refe renc es t o C Se rie s
in this document may or may not apply to these C...X
models.
4.2 Main Features
Thank you again for placing your confidence in Lab.
gruppen power amplifiers.
Your new C Series amplifier incorporates a number
of sophisticated technologies – many of them proprietary to Lab.gruppen – that are provided to ensure
the best possible performance and many years of
reliable operation. Familiarizing yourself with these
technologies will prove invaluable in setting up and
optimizing your loudspeaker system.
4.2.1 Class T D amplifier and regula ted switch-
mode power suppl y
Lab.gruppen’s patented Class TD technolog y combin es t he ex cept ion al ef fic ienc y of a Cla ss D amp lifie r
with the high sonic quality associated with Class B
designs. Class TD also incorporates the same basic
concepts behind Class H designs, but here they are
refined and pushed to a higher level to achieve much
greater efficiency.
The Class TD output sections work in concert with
Lab.gruppen’s unique, regulated switch-mode power
supply (R.SMPS ) to create a superior overall power
amplifier topolog y. This ensures st able, full output
power over an extremely wide range of mains voltage
levels. Sagging or fluctuating mains voltage will not
affect the power output delivered to the loudspeakers.
4.2.2 Amplifi er gain
For greater flexibility in system integration, C Series
amplifiers allow gain adjustment from +23 dB to +44
dB in 3 dB steps. This feature accommodates any
combination of input device and loudsp eaker type.
For example, if the input signal is weak, the gain can
be boosted to maintain maximum power output while
avoiding a poor signal-to-noise ratio. This gain adjustment feature makes it easier to achieve an optimal
balance between headroom and noise floor.
4.2.3 Voltage Peak Limi ter (VPL)
The Voltage Peak Limiter (V PL) feature allows user
adjustments that determine maximum voltage output,
thus matching the amplifier to the connected speaker
load. Whether the connected load is low impedance
(2 to 16 ohms) or high impedance (70 V / 100 V),
the VP L feature can be set to ensure that neither
temperature nor current limitations are exceeded
before reaching the desired voltage threshold.
4.2.4 Protec tion and performance
optimizatio n
Appropriate and reliable power amplification is vital
to any audio system. Inadequate or faulty power
amplification could cause damage to the loudspeakers,
or in some cases to the power amplifiers themselves.
To prevent any damage or costly service interruptions, C Series amplifiers offer advanced features
to protect both internal circuits and any connected
loads. These features even protect the mains fuse
that, in extreme cases, could be overloaded.
Following are short descriptions of standard built-in
C Series protection features:
CPL•, (Current Peak Limiter) ensures that the
amplifier’s output does not exceed the safe
current handling p arameters of amplifier
components.
Temperature pr otection• ensures that the
amplifier will not be damaged by exceeding
thermal limits.
PAL•, (Power Average Limiter) limits the
maximum average power consumption according
to the power supply and mains-breaker capabilities.
VHF•, (Very High Frequency) protection
circuits mute the output of the amplifier when
non-dynamic continuous signals above 10 kHz
are detected.
DC protection• ensures destructive DC
signals will not appear at the amplifier outputs.
If such conditions occur an internal fuse opens
and fault indication is displayed.
Low impedance• ( short circuit) protection
provides a fault warning indication and shuts
down the output stage when, for example, an
input signal is present and a malfunctioning cable
or driver is short circuiting the output.
High impedance• warning repor ts an alert
when, at the same time, output signal is high
and no current draw is measured. This situation
might occur when no speakers are connected,
or when a driver is blown.
Low inrush current• ensures that the
mains breaker will not trip when several power
amplifiers are turned on simultaneously.
4.2.5 NomadLi nk / Ethernet control a nd
monitoring net work
The NomadLink network allows easy setup and
control of C Series power amplifiers and other devices.
The patented network topology allows automatic
detection and addressing of multiple amplifiers, and
is controlled from a PC via an NLB 60 E NomadLink
Bridge & Network Controller using standard TCP/
IP communication. Phantom powering through the
network cables allows the software to detect devices
that are not currently turned on or connected to the
mains. This ensures very high reliability and redundancy levels while allowing connected amplifiers to
remain on standby with no power consumption.
Cable connections can be daisy- chained for easier
system setup. This also reduces total component
costs, simplifies installation, and makes daily operation more convenient. There is no need to create
a star topology using many switches as with, for
example, an Ethernet system. Indiv idual amplifier
addresses do not need to be manually entered: you
will automatically know where an individual amplifier
resides in the network.
A daisy chain network-loop, in combination with
the automatic addressing of devices, enables
Lab.gruppen’s proprietary DeviceControl software to
aut oma tic ally cre ate a prec ise pic ture of al l co nne cted
devices and their relative position in the chain. By
quickly creating a clear overview of the entire system
configuration, DeviceControl provides flexible control
over very large amplifier systems. Set-up time is
minimized, and critical information is readily available
WELCOME 4
C Series C 68:4 , C 48:4, C 28 :4 and C 16:4 Operation Manual 9
8 C Series C 68:4 , C 48:4, C 28 :4 and C 16:4 Operation Manual
for monitoring performance and so lving problems
during operation.
Via Noma dLink, you can monitor all metering d ata
as well as all faults and warning indications simultaneously. NomadLink also allows you to remotely
control power on and power off, as well as engage
Mute and Solo functions on individual channels.
5.1 Unpacking
Carefully open the shipping carton and check for any
noticeable damage. Every Lab.gruppen amplifier is
tested and inspected before leaving the factory and
should arrive in perfect condition. If any damage
is discovered, please notify the shipping company
immediately. Only the consignee may institute a
claim with the carrier for damage incurred during
shipping. Save the carton and packing materials for
the carrier ’s inspection. Should you ever need to
ship the amplifier, always use the original packaging
materials.
5.2 Mounting
The amplifier is two rack units high ( 2U) and will fit
into a standard EIA 19” rack. The depth is 34 3 mm
(13.5”). The weight is approximately 8, 5 kg (18.75
lbs.) depending on model type.
Free airflow from front-to-rear of the amplifier must
be possible. Therefore, no doors or rack-lids should
be mounted in front of or behind the amplifiers.
Amplifiers m ay be stacked directly on top of each
other. There is no need for spacing in between units,
though this might enable more convenient installation
of cabling on the rear panel.
It is recommended that rear supports be mounted
for maximum long-term stability.
5.3 Cooling
The amplifier uses a forced-air cooling system
with air flow from front-to -rear, maintaining a low
operating temperature within defined limits. Front-torear airflow is preferred as cooler air is present at the
front in nearly all installed applications. (This allows
higher continuous power levels without encountering
thermal problems. ) Never at tempt to reverse the
airflow. The amplifier modules require a pressure
chamber between the fans and heatsink, and this
effect functions only in one direction.
Ma ke su re th at t here is an ade qua te ai r su ppl y in f ront
of the amplifier, and that the rear of the amplifier has
sufficient space to allow the exhaust to escape. If
the amplifier is rack-mounted, do not use covers or
doors on the front or rear of the rack.
Should a heat sink overheat, the temperature
sensing circuits will mute the overheating channel.
If the power supply overheats, another sensing
circuit will mute all output channels until the power
sup ply coo ls to safe ope rati ng te mpe ratu re. A n ea rly
warning before shut down will be indicated on the
front-panel LEDs, and a warning will be sent through
the NomadLink network.
Always make sure that the dust-filters behind the
det ach abl e fro nt p anel are c lea n to e nsur e ma ximu m
possible airflow.
If the amplifier malfunctions due to dirty
dust-filters, any required repairs are not
covered by the warranty.
To calculate the maximum heat emission value, when
installing the amplifiers in rooms with an air-conditioning system, please refer to the Current Draw and
Thermal Emissions specifications provided in the
Appendix section.
5.4 Operating voltage
The lab el placed to the right of the mains
ca ble o n th e rea r of the a mpli fier ind icat es t he
AC mains voltage for which the amplifier is wired
and approved: 115 V or 230 V. Connect the p ower
cable only to the AC source type referred to on the
label. The warranty will not cover damage caused by
connecting to an incorrect type of AC mains.
Lab.gruppen switch- mode amplifiers use primary
switching. Bec ause the mains power is rectified
directly in front of the transformer, the amplifier is
insensitive to mains frequency. It may be connected
to 50 or 60 Hz sources, and actually will operate on
line frequencies from DC to 400 Hz.
If the power plug mounted at the factory is not
appropriate for your country, it can be removed and
the proper connector wired in its place as follows:
BLACK or BROWN LIVE
WHITE or BLUE NEUTRAL
GREEN or GREEN/ YELLOW EARTH (GROUND)
If you are not 100% confident of your
co mpe tenc e to rep lac e th e m ains plu g, eng age
qualified personnel to do the job.
Once a suitable AC supply is connected, the
amplifier can be turned on using the front-panel
power switch. The amplifier then goes through a
soft-start sequence as it self-checks its circuits. The
fans will blow at high speed before dropping to idle,
and the “power” LED will illuminate.
Inrush power is controlled and limited during “soft
start”, enabling multiple amplifiers to be powered up
simultaneously.
5.5 Grounding
There is no ground lift switch or terminal on the
C Series amplifiers. The signal ground is always
floating, via a resistor, to chassis and therefore the
grounding system is automatic.
In the interests of safety, never disconnect the earth
(ground) pin on the AC power cord.
Use balanced input connections to avoid hum and
interference.
5 INsTALL ATION INsTALL ATION 5
C Series C 68:4 , C 48:4, C 28 :4 and C 16:4 Operation Manual 11
10 C Series C 68:4, C 4 8:4, C 28:4 and C 16:4 Operation M anual
6 QUICK GUIDE OVERVIEW QUICK GUIDE OVERVIEW 6
The amplifier’s front panel presents the performance
and fault condition indicators, power and remote
switches, and a removable dust-filter cover. Four
level potentiometers located behind the cover
provide individual at tenuation for the four amp lifier
channels. Range is 0 dB to - infinit y. The 12 o’clock
position indicates -10 dB attenuation. A label area is
located beneath the LED display.
To remove the dust-filter cover, loosen the
thumbscrew at the far left. This allows removal of
the dust-filters for cleaning, and provides access to
channel attenuation. The front cover may be made
“tamper resistant” by replacing the thumbscrew
with a Philips head or safety Torx screw. Thread
size is M3.
Never operate the amplifier without the dust
-filters in place.
.
6.2.1 The DIP-s witch features
The following features may be adjusted using the
DIP-switches on the rear-panel of the amplifier.
Gain - Set for all four channels from +23 dB to +44
dB in 3 dB steps.
Option acti ve - Available for future upgrades.
Fan Masked - When on, engages the intelligent fan
feature which lowers fan speed when no signal is
present.
Bridged Mode - Switches the channel pairs (A+ B
and/or C+D ) into bridged mode operation (automatic
-6 dB gain compensation) .
VPL - Voltage Peak Limiter adjustment is
provided for 8 individual levels. Select the set ting
most appropriate for connected speakers. See
Appendix for details.
Mode - Select VPL mode to either Hard or Softoperation. F or channels driving sub -woofers and
low-frequency dr ivers, it is recommended to use
the Hard setting for optimal operation. For mid- and
high- frequency drivers, always select Soft.
Mains input 115 V
and 230 V operation
(Not selecta ble)
NomadLink
network In and Out
on EtherCon- housed
RJ45 connec tions
DIP-switches
for adjusting key
features
(See below)
3-pole Ph oenix-
type input
connectors
2-pole screw
terminal output
connections
6.2 Rear-Panel overview6.1 Front-Panel overview
Temperature mu te• (Yellow constant)
VHF• (Very H igh Frequency) protection active
( output muted) (Yellow)
Mute• channel via NomadL ink network (2x Yellow)
CPL• (Current Peak Limiter) active (O range flashing),
CPL• constant ( output muted): Lo impedance / Short circuit
detec tion
Fault• (Yellow plus Orange )
VPL• (Volta ge Peak Limiter) active, VPL/ Clip (Red)
4 dB• signal level ( Green)
-10 dB• signal level (Green )
-40 dB• sig nal level (Green),
Hi-Imp• open load detected ( Red)
Bridge mode• operation on (Yellow). Ch. A+ B or C+D
bridge d.
.
Power on (G reen)
PAL (Power Average Limiter) active ( Red)
Option acti ve (Yellow)
Nomad Link network active (Blue).
PAL
When no VPL,
CPL or PAL
indicators are
illuminated,
and the VPL DIP-switch
is set to maximum at the
specified nominal load,
the amplifier channel is
able to deliver maximum
rated output power.
6.1.1 Power on/off and remote switc h
Th e Pow er o n/ off swi tch is lo ca ted o n th e ri ght s ide . A
second switch, labeled “REMOTE,” is located above
the Power switch. When the Remote switch is on, (with
the mains connected and power switch turned on)
the yel low L ED a bove it w ill i llum inat e in dica tin g tha t
ex te r na l p ow er o n/ o ff c om ma n ds fr om th e No ma d Li nk
network connection will switch the amplifier on or
off. When Remote is activated the amplifier will not
switch on until a “Power On” command is received
from the network. When the remote switch is off,
it is not possible to switch amplifier power on or off
using NomadLink network control.
6.1.2 Front-panel LED’s
The front-panel LED area includes the following
indicators per channel:
When the network is c on-
nected, the blue NomadLink
LED will illuminate even
when mains power is not
connected. NomadLink receives
phantom power from the net work
supplied by the NLB 60E.
44dB
41dB
38dB
35dB
32dB
29dB
26dB
23dB
141V*
118V
100V**
85V
71V
59V
50V
42V
*100V
rms
**70V
rms
Ser. N:o
Removed!
SPEAKER OUTPUTS
BALANCED INPUTS
CH D
CH BCH C CH A
WIRING
NORMAL: CLASS 2
BRIDGED: CLASS 3
PUSH PUSH
Must be grounded
Made in Sweden
200-240VAC 50-60Hz :2300W
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