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Lab Gruppen C28-4
4ch 70v 700w/ch-4-ohms Amplifier

OUR PART #:  C28-4

The Lab Gruppen C 28:4 is one of two mid-power, four-channel amplifiers in the C Series family.
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The Lab Gruppen C 28:4 is one of two mid-power, four-channel amplifiers in the C Series family. Attractively packaged in a 2U chassis, it provides 4 × 700 W output into 4 ohm loads.

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 a single large 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 under network control.

Lab.Gruppen C 28:4 Amplifier Specifications:

  • General:
    • Number of amplifier channels: 4
    • Peak total output all channels driven: 2800 W
    • Peak output voltage per channel: 141 V
    • Max output current per channel: 12 Arms
  • Max output power (all channels driven):
    • 16 ohms: 600 W
    • 8 ohms: 700 W
    • 4 ohms: 700 W
    • 2 ohms: 300 W
    • Hi-Z per ch. (all ch.’s driven): 70 Vrms / 100 V peak: 700 W
  • Max output power bridged:
    • 16 ohms: 1400 W
    • 8 ohms: 1200 W
    • 4 ohms: 600 W
    • 2 ohms: Not recommended
    • Bridged per ch.: 140 Vrms / 200 V peak: 1400 W
  • Performance:
    • THD 20 Hz - 20 kHz at 1W: <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 kHz
    • Input impedance: 20 kOhm
    • Common Mode Rejection (CMR): >50 dB, 20 Hz - 20 kHz
    • Output impedance @ 100 Hz: 30 mOhm
  • Gain, Sensitivity and Limiters:
    • 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
    • Amplifier gain selectable (all channels) – rear-panel switches: 23, 26, 29, 32, 35, 38, 41, 44 dB
    • Default gain: 35 dB
    • Level adjustment (per channel): Front-panel potentiometer, 21 position detented from -inf to
  • Connectors and Buttons:
    • 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 IN and OUT
    • Intelligent fans (on/off): Yes, depending on presence of output signal
    • Power: Individual switches on front panel
    • Cooling: Two fans, front-rear airflow, temperature controlled speed
  • Front-panel user interface:
    • Common: NomadLink Network; Power Average Limiter (PAL)5; 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 V / 65 -135 V 4
    • Minimum power-up voltage, 230 V / 115 V: 171 V / 85 V
    • Power Average Limiter (PAL) 5: Yes
    • Power Factor Correction (PFC): No
    • 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; C16:4: 15A/NEMA 5-15P
  • Dimensions (WxHxD): 19” x  2 U x 13.5” (483 x 88 x 343 mm)
  • Weight: 26.4 lbs.(12 kg)
  • Finish: Blackpainted steel chassis with gray painted steel front
  • Approvals: CE, ANSI/UL 60065 (ETL), CSA C22.2 NO. 60065, FCC

 

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