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Lab Gruppen C20-8X
C Series 8-Channel 70V Amplifier

OUR PART #:  C20-8X

Lab Gruppen's C 20:8X delivers 8 × 250 W (max.
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Lab Gruppen's C 20:8X delivers 8 × 250 W (max. continuous output power, all 8 channels driven, VPL set at 100 V and Gain set at 32 dB) at 4 ohms, 8 ohms, 16 ohms or 70 Vrms; 500 W at 100 Vrms is available in bridge mode.

The C 20:8X employs a cost-efficient, proprietary Class D output design.  Other features include a universal power supply, selectable 35 Hz high-pass filter, and built-in GPIO control facilities.

Each channel has an individually configurable Voltage Peak Limiter (VPL), which allows the output to be optimized for any loudspeaker load – whether a single large subwoofer or a series of small 70 V loudspeakers (100 V in bridge mode).  VPL works in combination with adjustable input gain (adjustable in 2-channel blocks) to achieve maximum headroom regardless of input levels or output impedances.  Additionally a 35 Hz high pass filter may be inserted in each 2-channel section.

Every C Series amplifier 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 under network control.

GPIO facilities allow access to key amplifier functions such as power on/off and fault reporting.

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

Lab.Gruppen C20-8X Amplifier Specifications:

  • Number of channels: 8
  • Peak total output all channels driven: 2000 W
  • Peak output voltage per channel: 100 V / 70 Vrms
  • Max. output current per channel: 8 Arms
  • Dimensions: 19" W x 13.5" D x 2RU H (483 x 88 x 343mm)
  • Weight: 18.75 lbs. (8.5 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: 250 W
  • 8 Ohms: 250 W
  • 4 Ohms: 250 W
  • 2 Ohms: 125 W
  • Hi-Z: 250 W (70 Vrms/100 V peak)

Max. Output Power Bridged per Channel:

  • 16 Ohms: 500 W
  • 8 Ohms: 500 W
  • 4 Ohms: 250 W
  • 2 Ohms: n.r.
  • Hi-Z: 500 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: 2.3 Hz - 56 kHz
  • Input impedance: 20 kOhm
  • Input Common Mode Rejection, CMR: 50 dB
  • Output impedance @ 100 Hz: 48 mOhm

Voltage Peak Limiter (VPL), max. peak output:

  • VPL, selectable per ch.: 100, 63, 45, 32 V
  • VPL, selectable when bridged: 200, 126, 90, 64 V
  • Voltage Peak Limiter mode (per ch.): Hard / Soft

Gain and Level:

  • Amplifier gain selectable (all channels) – rear-panel switches: 29, 32,35, 38 dB
  • Default gain: 32 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, C+D, E+F, G+H, inputs A, C, E, G are signal 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
  • General Purpose Outputs (GPO): Contact Closure types, 2-pole Phoenix
  • General Purpose Inputs (GPI): Contact Closure types, 2-pole Phoenix

Front-panel indicators:

  • Common: NomadLink® Network; Power Average Limiter (PAL); Power on
  • Per channel: Signal present / High-impedance; Voltage Peak Limiter (VPL);Current Peak Limiter (CPL):
    Very High Frequency (VHF); High temperature;Fault; Mute

Power:

  • Operating voltage, 230 V / 115 V nominal: 100-240 V
  • Minimum power-up voltage, 230 V / 115 V: 80 V
  • Power Average Limiter (PAL): Yes
  • Soft start / Inrush current draw: Yes / max. 5 A
  • Mains connector: IEC Inlet / NEMA 5-15P

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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