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Lab Gruppen C88-4
C Series 4-Channel 70V Amplifier (4x2200W)

OUR PART #:  C88-4

The Lab.Gruppen C 88:4 is the new flagship of the C Series and is the most powerful single frame, 4-channel installation amplifier ever built.
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The Lab.Gruppen C 88:4 is the new flagship of the C Series and is the most powerful single frame, 4-channel installation amplifier ever built! Delivering an amazing 4 Ă— 2200 W at 2 ohms, this amplifier is powerful enough for the most demanding of installed sound applications including, larger sub-woofers, large array systems and broader multi-power-level/impedance applications. Packaged in a compact 2U chassis, the C 88:4 sets a new benchmark for extreme power and flexibility in an installation-dedicated amplifier.

C Series amplifiers are uniquely capable of adapting to a wide variety of demanding load conditions. Each channel has an individually configurable Voltage Peak Limiter (VPL™), which allows the output to be optimized for any loudspeaker load – whether one massive subwoofer or a series of small 100/70 V loudspeakers. VPL works in combination with adjustable input gain to achieve maximum headroom regardless of input levels or output impedances.

Every C Series is ready for the NomadLink® network right out of the box. With NomadLink, key amplifier parameters are displayed via DeviceControl software, and remote control of channel mutes and power on/off is managed efficiently under network control.

Lab.Gruppen C88-4 Amplifier Features:

  • Unprecedented power density – Total output of 8800 W (2 ohms) in 2U
  • Four channels – All channels bridgeable for 2- or 3-channel configurations
  • Lo-Z or Hi-Z (70 V / 100 V) – Selectable per channel, normal or bridged
  • Patented Class TD® amplifier topology
  • Voltage Peak Limiter (VPL) – Configurable per channel to optimize each output for connected loads
  • Phoenix-type input connectors
  • Screw terminal output connectors
  • Comprehensive protection and warning – Excessive output current, DC, high temperature, very high frequency (VHF), shortcircuit, open load, mains fuse protection, and soft start
  • Efficient and uniform Intercooler® cooling
  • NomadLink® network ready

Lab.Gruppen C88-4 Amplifier Specifications:

General

  • Number of Channels: 4
  • Peak total output al channels driven:  8800 W
  • Peak output voltage per channel:  141V
  • Max. output current per channel:  35.5 Arms
  • Dimensions (W/H/D): 19” x 2 U x 13.5” (483 x 88 x 343 mm)
  • Weight 26.4 lbs. (12 kg)
  • Finish Black painted steel chassis with gray painted steel front

Max. Output Power

16 ohms

8 ohms

4 ohms

2 ohms

70 Vrms/100 Vrms peak

Per ch. (all ch.'s driven)

625 W

1250 W

2100 W

2200 W

2200 W

Bridged per ch.

2500 W

4200 W

4600 W

n.r.

n.r

Performance with Gain: 35 dB and VPL: 141 V

  • THD 20 Hz - 20 kHz for 1 W: <0.1%
  • THD at 1 kHz and 1 dB below clipping: <0.05%
  • Signal To Noise Ratio: >112 dBA
  • Channel separation (Crosstalk) at 1 kHz: >70 dB
  • Frequency response (1 W into 8 ohms) +0/-3 dB: 6.8 Hz- 34.2 kHz
  • Input impedance: 20 kOhm
  • Input Common Mode Rejection, CMR: 50 dB
  • Output impedance @ 100 Hz: 30 mOhm

Voltage Peak Limiter (VPL), max. peak output

  • VPL, selectable per ch.: 141, 118, 100, 85, 71, 59,50, 42 V
  • VPL, when bridged: 282, 236, 200, 170, 142, 118, 100,84 V
  • Voltage Peak Limiter mode (per ch.): Hard / Soft

Gain and Level

  • Amplifier gain selectable (all channels) – rear-panel switches:  23, 26, 29, 32, 35, 38, 41, 44 dB
  • Default gain: 35 dB
  • Level adjustment (per ch.): Front-panel potentiometer, 21 position detented from -inf to 0 dB, hidden behind security panel/dust filter grille

Connectors and switches

  • Input connectors (per ch.):  3-pin Phoenix, electronically balanced
  • Output connectors (per ch.):  Barrier strip 2-pole screw terminals
  • Output bridge mode:  A+B and/or C+D, inputs A and C are input source
  • NomadLink network:  On board, 2 x RJ45 connectors
  • Intelligent fans (on/off): Yes, depending onpresence of output signal
  • Power on/off and Remote enable on/off: Individual switches on front-panel
  • Cooling: Two fans, front-to-rear airflow, temperature controlled speed

Front-panel indicators

  • Common: NomadLink Network; Power Average Limiter (PAL) 2); Power on
  • Per channel: Signal present / High-impedance; -10 dB and -4 dB output signal; Voltage Peak Limiter (VPL); Current Peak Limiter (CPL); Very High Frequency (VHF); High Temperature; Fault; Mute

Power

  • Operating voltage, 230 V / 115 V nominal: 130 -265 / 65-135 V
  • Minimum power-up voltage, 230 V / 115 V: 171 V / 85 V
  • Power Average Limiter (PAL): Yes
  • Soft start / Inrush Current Draw: Yes /max. 5 A
  • Mains connector: 230 V CE: 16 A, CEE7; 115 V ETL: 30 A TwistLock

Approvals:  CE, ANSI/UL 60065 (ETL), CSA C22.2 NO. 60065, FCC

Note 1: Automatic -6 dB gain compensation when bridging channels. Ch.’s A+B and/or C+D, can be bridged individually.
Note 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.
Note 3: For sine waves, peak voltage output values translate to Vrms with the formula V/1.41 = Vrms. E.g. 100 V peak equals app. 70 Vrms. Hence, outputs can be set for high-impedance loads without requiring a transformer.
Note 4: 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 recommended.

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