Lab Gruppen C88-4

C Series 4-Channel 70V Amplifier (4x2200W)

OUR PART #: C88-4 Write the First Review.

  • 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
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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 × 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:
    • Per ch. (all ch.'s driven): 625 W @ 16 ohms, 1250W @ 8 ohms, 2100W @ 4ohms, 2200W @ 2 ohms, 2200W @ 70/100 Vrms
    • Bridged per ch.: 2500W @16 ohms, 4200W @ 8 ohms, 4600W @ 4 ohms, 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 significantly higher than running individual channels and therefore this mode of operation is not recommended.

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