4-channel sound amplifier Helix H 400X

4-channel amplifier with integrated active crossover.

• Power RMS/MAX:
  @ at 4 ohms - 4 x 70W / 140W
  @ at 2 ohms - 4 x 125W / 250W
  By bridge @ at 4 ohms - 2 x 250W / 500W
• Frequency range: 20 Hz - 20,000 Hz
• Damping factor: > 300
• Input sensitivity: 0.7 - 8 Volts
• Dimensions: 31.5 x 200 x 336 mm

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 again and again over the years, these powerhouses with the characteristic, transparent enclosure covers have reached a sound level that is unrivaled, not only in the value-for-money category.

• 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 optimized 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 using only selected components

• Highpass 15 - 4,000 Hz adjustable
• Lowpass 15 - 4,000 Hz adjustable
• Bandpass 15 - 4,000 Hz adjustable
• Total harmonic distortion (THD) < 0.009 %
• Signal-to-noise ratio > 100 dB

User Guide