Helix H-400X – Amplifier

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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Description

Output power RMS / max.
– @ 4 Ohms 4 x 70 / 140 Watts
– @ 2 Ohms 4 x 125 / 250 Watts
– @ 1 Ohm –
– bridged @ 4 Ohms 2 x 250 / 500 Watts
– bridged @ 2 Ohms –
Amplifier technology Class AB
Inputs 4 x RCA / Cinch
1 x Remote In
Input sensitivity RCA / Cinch 0.7 – 8 Volts
Input impedance RCA / Cinch 10 kOhms
Input impedance highlevel –
Outputs 4 x Speaker output
Output voltage RCA / Cinch –
Signal converter for digital input –
Frequency response 20 Hz – 20,000 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 110 dB (A-weighted)
Distortion (THD) < 0.009 %
Damping factor > 300
Operating voltage 9 – 17 Volts
Idle current 2200 mA
Fuse 2 x 25 A LP-Mini-fuse (APS)
Additional features Active, 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”
Ampli - Amplifiers