Power amplifier Lab.Gruppen C28:4

Lab.Gruppen C28:4

The 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.

Specs

Model: C Series 28:4

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 1
• Bridged per ch.: 140 Vrms/200 V peak 1400 W

Performance:

• THD 20 Hz - 20 kHz at 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 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 2 141, 118, 100, 85, 71, 59, 50, 42 V
• VPL, when bridged 2 3 282, 236, 200, 170, 142, 118, 100, 84 V
• Voltage Peak Limiter mode (per ch.) Hard / Soft
• Amplifier gain selectable (all channels) – rear-panel switches 3 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: W: 483 mm (19”), H: 88 mm (2 U), D: 343 mm (13.5”)

Weight: 12 kg (26.4 lbs)

Warranty: 12 month