Lab.gruppen C 28:4 Technical Data - page 2
General
Number of 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
16 ohms
8 ohms
4 ohms
2 ohms
Hi-Z
Per ch. (all ch.’s driven)
600 W
700 W
700 W
300 W
700 W (70 Vrms / 100 V peak)
Bridged per ch.
1400 W
1200 W
600 W
n.r.
1400 W (140 Vrms / 200 V peak)
Performance with Gain: 35 dB and VPL: 100 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 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.
3)
141, 118, 100, 85, 71, 59, 50, 42 V
VPL, when bridged
3)
1)
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)
1)
– 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 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)
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
4)
Minimum power-up voltage, 230 V / 115 V
171 V / 85 V
Power Average Limiter (PAL)
2)
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
Dimensions (W/H/D)
W: 483 mm (19”), H: 88 mm (2 U), D: 343 mm (13.5”)
Weight
12 kg (26.4 lbs.)
Finish
Black painted steel chassis with gray painted steel front
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): Separate 230 V or 115 V versions available. Not selectable on the amplifier.
All specifications are subject to change without notice.
Item no. TDS-C284_V5
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Specifications C 28:4