C FOUR    定價NT$69800

4-channel high-end amplifier with integrated, active crossover



Product Speclflcation



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.



  • Extremely broadband Class AB amplifier with eight selected MOSFET transistors per channel for exceptional sound quality - ideal for High-Resolution audio

  • Ultra low-noise and distortion-free power amp drivers in Class A technology

  • Enormous damping factor of 1,000 @ 4 Ohms for perfect speaker control

  • Optionally available HELIX Digital Input Module (HDM) to extend the amplifier with two optical digital inputs in SPDIF format

  • Integrated, active crossover with highpass, lowpass and bandpass

  • Regulated DC / DC switching power supply with Start-Stop capability down to 6V supply voltage

  • Microprocessor-based monitoring of amplifier status including temperature-dependent fan control

  • Input Mode switch for flexible routing of the input signals

  • Cutting-edge BurrBrown D/A converters with 32 Bit resolution in combination with the optional HDM 2 module

  • Massive 24-carat gold-plated power and speaker terminals

  • Quad-layer PCB with extra-solid 70μ copper traces for lowest possible losses and SMD (Surface Mounted Device) manufacturing technology




Output power RMS / max.     
- @ 4 Ohms  
- @ 2 Ohms    
- @ 1 Ohm    
- bridged @ 4 Ohms    
- bridged @ 2 Ohms    

Max. output power per channel*
Amplifier technology   




Input sensitivity   

Input impedance RCA / Cinch 

Input impedance highlevel   

Output voltage RCA / Cinch     
Signal converter for digital input    

Frequency response    
Bass boost     
Highpass    15 Hz - 4,000 Hz adjustable
Lowpass    40 Hz - 4,000 Hz adjustable
Bandpass    15 Hz - 4,000 Hz adjustable

Slope high- / lowpass    
Slope subsonic / lowpass    
Signal-to-noise ratio digital input    
Signal-to-noise ratio analog input    98 dB (A-weighted)
Distortion (THD)    
Damping factor    
Operating voltage 
Idle current    
Additional features    


Dimensions (H x W x D)    


4 x 150 / 300 Watts

4 x 220 / 440 Watts


2 x 440/ 800 Watts


Up to 250 Watts RMS @ 2 Ohms
Class AB


4 x RCA / Cinch
1 x Remote In
Optional via HDM 2 module:
2 x Optical SPDIF (28 - 96 kHz)

RCA / Cinch 1 - 8 Volts

7.5 kOhms



4 x Speaker output




10 Hz - 80,000 Hz


15 Hz - 4000 Hz adjustable

15 Hz - 4000 Hz adjustable

15 Hz - 4000 Hz adjustable


12 dB/Oct.


112 dB (A-weighted)


< 0.007 %

> 1000

9 - 16 Volts (max. 5 sec. down to 6 Volts)

2,400 mA

3 x 30 A LP-Mini-fuse (APS)

Active, adjustable crossover, HDM slot, input mode switch, High-Resolution audio, Start-Stop capability

37.1 x 430 x 240 mm /
1.46 x 16.93 x 9.45"