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Lab Gruppen C68-4
C Series 4-Channel 70v Amplifier (4x1700W)

OUR PART #:  C68-4

Lab Gruppen's C 68:4 delivers 4 × 1700 W and is capable of adapting to a wide variety of demanding load conditions.
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Lab Gruppen's C 68:4 delivers 4 × 1700 W and is 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.

For more information, please consult the attached sheet (under "Documents")

Lab.Gruppen C 68:4 Amplifier Specifications:

  • Number of channels: 4
  • Peak total output all channels driven: 6800 W
  • Peak output voltage per channel: 141 V
  • Max. output current per channel: 24.5 Arms
  • Dimensions: 19" W x 13.5" D x 2RU H (483 x 88 x 343mm)
  • Weight: 26.4 lbs. (12 kg)
  • Finish: Black painted steel chassis with gray painted steel front
  • Approvals: CE, ANSI/UL 60065 (ETL), CSA C22.2 NO.60065, FCC
  • Max. Output Power per Channel (all channels driven):
    • 16 Ohms: 650 W
    • 8 Ohms: 1200 W
    • 4 Ohms: 1700 W
    • 2 Ohms: 1200 W
    • Hi-Z: 1600 W (70 Vrms/100 V peak)
  • Max. Output Power Bridged per Channel:
    • 16 Ohms: 2400 W
    • 8 Ohms: 3400 W
    • 4 Ohms: 2400 W
    • 2 Ohms: n.r.
    • Hi-Z: 3200 W (140 Vrms/200 V peak)
  • Performance with Gain: 32 dB and VPL: 100 V
    • THD 20 Hz - 20 kHz for 1 W: <0.1%
    • THD at 1 kHz and 1dB 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, selectable when bridged: 282, 236, 200, 170, 142, 118, 100, 84V 
    • 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 positiondetented from -inf to 0 dB, hidden behind security panel/dust filtergrille
  • 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
    • High pass filter: Fixed at 35 Hz, switchable per channel
    • NomadLink® network: On board, 2 x RJ45 connectors, IN and OUT
    • Intelligent fans (on/off): Yes, depending on presence 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); Power on
    • Per channel: Signal present / High-impedance; -10 dB & -4 dB outputsignal; Voltage Peak Limiter (VPL); Current Peak Limiter (CPL): Very HighFrequency (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: 20 A / NEMA 5-20P

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.
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.

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