H 400X

The best of both worlds – extremely fast MOSFET driver circuits in Class A operation combined... more

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.

Class-AB RCA-Input Active crossover SMD Made-in-Germany
Extremely stable amplifiers in an extraordinary shallow heatsink Unique Bipolar... more
  • Extremely stable amplifiers in an extraordinary shallow heatsink
  • Unique Bipolar output transistor technology for unparalleled natural and warm sound experience
  • Fastest drivers for lowest possible THD
  • Processor-controlled technology for optimized operation
  • Fully active crossover with highpass, lowpass and bandpass filter
  • "Input mode" switch for flexible input signal routing
  • RMI (Realmixed Input) for generating an optimised mono-summing signal from
    the left and right channels
  • Smart protection circuits against overheating, over- and undervoltage, speaker short circuiting, low impedance and faulty connection
  • 24 carat gold-plated solid connection terminals suitable for 25 mm² / gauge 4
  • Completely made in Germany by using only selected components
Output power RMS / max.   - @ 4 Ohms 4 x 70 / 140 Watts - @ 2... more
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”
1 x Amplifier HELIX H 400X 2 x Allen key 1 x Mounting material 1 x Instruction manual more

1 x Amplifier HELIX H 400X
2 x Allen key
1 x Mounting material
1 x Instruction manual