Helix C Four high-end 4-channel amplifier

Audiophile sound quality combined with impressive output power

The C FOUR is a high-end 4-channel amplifier that has been designed down to the last detail for ultimate sound quality. Audiotec Fischer’s proprietary ultra low-noise and ultra low-distortion Class A driver stage feeds a total of 32 hand-selected MOSFET power transistors, resulting in an incredible damping factor of 1,000 for relentless control of every loudspeaker. The intelligent regulation of the power supply assures stable conditions for the output stages and therefore phenomenal output power independent of the cars battery voltage.
In combination with the optionally available digital input module HDM 2, the C FOUR demonstrates the perfect transition to the digital era. The HDM 2 accepts digital audio signals up to 96 kHz sampling rate via its two optical inputs followed by cutting-edge BurrBrown D/A converters with 32 Bit resolution that transform the signals back to the analog domain. Therefore the C FOUR is absolutely future-proof and perfectly prepared for the combination with our digital signal processors.

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Output power RMS / max.
– @ 4 Ohms 4 x 150 / 300 Watts
– @ 2 Ohms 4 x 220 / 440 Watts
– @ 1 Ohm
– bridged @ 4 Ohms 2 x 440 / 880 Watts
– bridged @ 2 Ohms
Amplifier technology Class AB
Inputs 4 x RCA / Cinch
1 x Remote In
Optional via HDM 2 module:
2 x Optical SPDIF (28 – 96 kHz)
Input sensitivity RCA / Cinch 1 – 8 Volts
Input impedance RCA / Cinch 7.5 kOhms
Input impedance highlevel
Outputs 4 x Speaker output
Output voltage RCA / Cinch
Signal converter for digital input
Frequency response 10 Hz – 80,000 Hz
Bass boost
Highpass 15 Hz – 4,000 Hz adjustable
Lowpass 15 Hz – 4,000 Hz adjustable
Bandpass 15 Hz – 4,000 Hz adjustable
Subsonic
Phase
Slope high- / lowpass 12 dB/Oct.
Slope subsonic / lowpass
Signal-to-noise ratio digital input
Signal-to-noise ratio analog input 112 dB (A-weighted)
Distortion (THD) < 0.007 %
Damping factor > 1000
Operating voltage 9 – 16 Volts  (max. 5 sec. down to 6 Volts)
Idle current 2400 mA
Fuse 3 x 30 A LP-Mini-fuse (APS)
Additional features Active, adjustable crossover, HDM slot, input mode switch, High-Resolution audio, Start-Stop capability
Dimensions (H x W x D) 37.1 x 430 x 240 mm /
1.46 x 16.93 x 9.45″