C 68:4
The C 68:4 delivers 4 × 1700 W at 4 ohms, making this amplifier powerful enough for the vast majority of demanding installed sound applications. Packaged in a compact 2U chassis, the C 68:4 sets a new standard for high power in an installation-dedicated amplifier.
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 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.
TECHNICAL SPECIFICATIONS
General 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
Max output power all channels driven 16 ohms: 650 W 8 ohms: 1200 W 4 ohms: 1700 W 2 ohms: 1200 W Hi-Z per ch. (all ch.’s driven): 70 Vrms / 100 V peak: 1600 W
Max output power bridged 16 ohms: 2400 W 8 ohms: 3400 W 4 ohms: 2400 W 2 ohms: Not recommended (*1) Bridged per ch.: 140 Vrms / 200 V peak: 3200 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 (*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 - Weight - Finish Dimensions: 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
Approvals CE, ANSI/UL 60065 (ETL), CSA C22.2 NO. 60065, FCC .
Notes *1: Regarding n.r. (not recommended) notes: The amplifier will be fully operational in bridge-mode into 2 ohm and high impedance (Hi-Z) loads, but due to physical constraints in the construction, the max. output power will not be significantly higher than running individual channels and therefore this mode of operation is not recommended. *2: 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. *3: Automatic -6 dB gain compensation when bridging channels. Ch.’s A+B and/or C+D, can be bridged individually. *4: Separate 230 V or 115 V versions available. Not selectable on the amplifier. *5: 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.
