Audio Fischer Helix H 400X

The best of both worlds – extremely fast MOSFET driver circuits in Class A operation combined with enormously load-stable, power-potent “afterburners” in bipolar technology. This is the recipe for success for the particularly flat amplifiers, which, thanks to their sophisticated processor control, don’t get their feathers ruffled in any situation. Improved repeatedly over the years, these powerhouses with the characteristic and transparent enclosure covers have reached a sound level that is unrivalled, and not just in the value-for-money category.

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Output power RMS / max.
– @ 4 Ohms4 x 70 / 140 Watts
– @ 2 Ohms4 x 125 / 250 Watts
– @ 1 Ohm
– bridged @ 4 Ohms2 x 250 / 500 Watts
– bridged @ 2 Ohms
Amplifier technologyClass AB
Inputs4 x RCA / Cinch
1 x Remote In
Input sensitivityRCA / Cinch 0.7 – 8 Volts
Input impedance RCA / Cinch10 kOhms
Input impedance highlevel
Outputs4 x Speaker output
Output voltage RCA / Cinch
Signal converter for digital input
Frequency response20 Hz – 20,000 Hz
Bass boost
Highpass15 Hz – 4,000 Hz adjustable
Lowpass15 Hz – 4,000 Hz adjustable
Bandpass15 Hz – 4,000 Hz adjustable
Subsonic
Phase
Slope high- / lowpass12 dB/Oct.
Slope subsonic / lowpass
Signal-to-noise ratio digital input
Signal-to-noise ratio analog input110 dB (A-weighted)
Distortion (THD)< 0.009 %
Damping factor> 300
Operating voltage9 – 17 Volts
Current draw2200 mA
Fuse2 x 25 A LP-Mini-fuse (APS)
Additional featuresActive, adjustable crossover, input mode switch,  Colour Protection System
Dimensions (H x W x D)31.5 x 200 x 336 mm /
1.24 x 7.87 x 13.23”