FP4000 Specification Sheet
Technical Data
FP+ Series: Dedicated Touring Amplifiers
FP 4000
•• High power density – The FP 4000 delivers a total of 4000 W (2
x 2000 W @ 2 ohms) in only 2U.
•• Lab.gruppen sound quality – FP 4000 amplifiers maintain the
Lab.gruppen’s reputation for sound quality, with transparent
mid- and high-frequency performance and new circuit designs
optimized for sustained low-frequency output.
•• NomadLink® network ready – Monitoring and control of key
functions accessible via the intuitive DeviceControl software and
the robust, daisy-chained NomadLink® network, as well as by the
leading third party control platforms.
•• Patented Class TD® amplifier topology – Road-proven output
stage delivers Class B audio quality with Class D efficiency.
•• Efficient cooling system – Unique, lightweight Intercooler ® copper cooling system dissipates more heat to allow extended peak
•• Adjustable parameters – Selectable Gain, scalable Voltage Peak
Limiter (VPL™), and bridge-mode operation allow custom configuration for any system or application.
•• XLR input and link connectors
•• Heavy-duty binding post or Speakon™ output connectors
•• Comprehensive protection and warning – Excessive output
current, DC, high temperature, very high frequency (VHF), short
circuit, open load, mains fuse protection, and soft start.
•• Regulated Switch Mode Power Supply (R.SMPS™) – Output
power remains constant even with significant drops in the mains
A Benchmark For Touring Amplification
Over the past decade, the tight and transparent sound of
Lab.gruppen touring amplifiers has earned the praise of renowned
FOH engineers and leading sound rental companies worldwide.
The FP+ Series model FP 4000 continues this tradition. At the core
of the FP 4000’s performance is the patented Class TD output stage,
a breakthrough amplifier topology that approaches the exceptional
efficiency of Class D while retaining the sonic purity of proven Class B
technology designs. Further contributing to the remarkable efficiency
of the FP 4000 is a Regulated Switch Mode Power Supply (R.SMPS),
which gives the added benefit of stabilizing rail voltages to the output
even with wide fluctuations of mains voltage. A highly refined and
updated circuit layout optimizes the interaction of R.SMPS and Class
TD to produce the high power density of the FP 4000.
To keep its cool under extreme demands, the FP 4000 relies on
Lab.gruppen’s proprietary Intercooler. This innovation uses thousands of copper fins to multiply the exposed heatsink surface’s rapid
heat dissipation. Also, all output devices are mounted transverse to
the airflow for uniform cooling. As a result, the FP 4000 delivers
Lab.gruppen’s’ trademark “all the power, all the time” with no
degradation of sonic performance.
To maximize headroom in any application, the FP 4000 offers
adjustable input gain along with Lab.gruppen’s exclusive Voltage Peak
Limiter (VPL). Adjustable on a per-channel basis, VPL optimizes the
output for any load, from a single massive subwoofer to a series of
HF compression drivers.
The comprehensive warning and protection features on the
FP 4000 safeguard output circuits and connected loads while also
extending amplifier life and minimizing the chance of service interuptions. Whether it’s a matter of faulty wiring, improper use, or extreme
ambient temperatures, the FP 4000 gives clear indication of any problems. Automatic protection measures engage only at critical thresholds. Operating conditions are re-checked every six seconds and, if
a fault is detected, normal operation is resumed when measurements
return to nominal.
The FP 4000 is shipped with a NomadLink network interface as
standard. In conjunction with DeviceControl software, NomadLink
allows comprehensive monitoring of amplifier status (including fault
or warning indications) and also enables remote control of power on/
off, channel mute, and channel solo functions. NomadLink is compatible with popular third-party control platforms; a separate NLB 60E
NomadLink Bridge & Network Controller is required.
Specifications FP 4000
Number of channels
Peak total output both channels driven
Peak output voltage per channel
Max. output current per channel
Max. Output Power
Per ch. (both ch.’s driven)
Bridged per ch.
4000 W
121 V
50 A peak
2 ohms
2000 W
n.r. 3)
Performance with Gain: 35 dB and VPL: 150 V
THD 20 Hz - 20 kHz for 1 W
THD at 1 kHz and 1 dB below clipping
Signal To Noise Ratio
Channel separation (Crosstalk) at 1 kHz
Frequency response (1 W into 8 ohms) +0/-3 dB
Input impedance
Input Common Mode Rejection, CMR
Output impedance @ 100 Hz
>112 dBA
>70 dB
2 Hz - 34.2 kHz
20 kOhm
45 dB
56 mOhm
Voltage Peak Limiter (VPL), max. peak output
VPL, selectable per ch.
VPL, selectable when bridged 1)
Voltage Peak Limiter mode (per ch.)
121, 101, 83, 70, 56, 47, 38 V
242, 202, 166, 140, 112, 94, 76 V
Hard / Soft
Gain and Level
Amplifier gain selectable (all channels)
– rear-panel switches
Default gain
Level adjustment (per ch.)
Connectors and Switches
Input connectors (per ch.)
Output connectors (per ch.)
Output bridge mode
NomadLink® network
Intelligent fans (on/off)
Power on/off and Remote enable on/off
Front-panel indicators:
Per channel
4 ohms
1600 W
4600 W
8 ohms
800 W
3200 W
23, 26, 29, 32, 35, 38, 41, 44 dB
38 dB
Front-panel potentiometer, 31 position detented from -inf to 0 dB
3-pin XLR, electronically balanced
Neutrik Speakon or Binding Posts (must be specified upon order)
A+B - Ch. A is signal input source
On board, 2 x RJ45 EtherCon connectors, IN and OUT
Yes, depending on presence of output signal
Individual switches on front-panel
Two fans, front-to-rear airflow, temperature controlled speed
NomadLink Network; Power Average Limiter (PAL) 2); Power on
Signal present / High-impedance; -20 dB, -15 dB, -10 dB and -4 dB output signal;
Voltage Peak Limiter (VPL); Current Peak Limiter (CPL); Very High Frequency (VHF); High temperature; Fault; Mute
Operating voltage, 230 V / 115 V nominal 4)
Minimum power-up voltage, 230 V / 115 V
Power Average Limiter (PAL) 2)
Soft start / Inrush Current Draw
Mains connector
130-265 V / 65-135 V
171 V / 85 V
Yes / max. 5 A
230 V CE: 16 A, CEE7; 115 V ETL: 20 A / NEMA 5-20P
Dimensions (W/H/D)
W: 483 mm (19”), H: 88 mm (2 U), Overall D: 396 mm (15.6”), Mounting D: 358 mm (14.1”)
12 kg (26.4 lbs.)
Black painted steel chassis with gray painted steel front
CE, ANSI/UL 60065 (ETL), CSA C22.2 NO. 60065, FCC
16 ohms
400 W
1600 W
1): Automatic -6 dB gain compensation when bridging channels.
2): PAL can reduce the maximum output power to keep the power supply operating safely, and/or to prevent excessive current draw tripping the mains breaker. Refer to Operation Manual.
3): Regarding n.r. (not recommended) notes: The amplifier will be fully operational in bridge-mode into 2 ohm and high impedance (Hi-Z) loads, but due to physical
constraints in the construction, the max. output power will not be significanty higher than running individual channels and therefore this mode of operation is not
4): Separate 230 V or 115 V versions available. Not selectable on the amplifier.
All specifications are subject to change without notice.
Intercooler, NomadLink and Class TD are national and/or international registered trademarks of Lab.gruppen AB. R.SMPS and VPL are trademarks of Lab.gruppen AB. All other trademarks remain the property of their respective owners. Copyright © 2009 Lab.gruppen AB. All rights reserved.
L a b . g r u p p e n AB • S w e d e n
internationaL contact • info@L abgruppen.com
U S CONTACT • i n f o @ TCU S . c o m
Item no. TDS-FP4000_V2
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