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Product Code: Helix D Four
Availability: In Stock
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Helix D Four 4 Channel Amp 720W Max

The new entry into the HELIX world! The amplifiers of the D series are solely modest with respect to pricing. Everything else is thoroughly pure HELIX quality without any compromises. Loads of power, excellent measurement data and a whole bunch of features ensure a pristine and crispy sound experience!

Absolutely nothing has been missed for powerful sound reproduction - the active crossover with highpass filter, lowpass filter, bandpass and bass boost are equally as self-evident as the intelligent highlevel input that incorporates Audiotec Fischer´s proprietary ADEP circuit. It is even possible to add an optional volume remote control for the amp channels C and D which is very useful if those outputs are firing a subwoofer.

The elegant design not only states right from the beginning the amp's heritage but also allows an easy integration into your car thanks to its compact dimensions. That is sound-tuning at its best!

Core Features:

  • 4-channel high- and lowlevel input
  • Smart highlevel input with ADEP circuit (Advanced Diagnostics Error Protection) and Auto Turn-On function
  • Fully active crossover with highpass, lowpass, bandpass and bass boost
  • Extremely stable MOSFET power supply
  • “Input mode” switch for flexible input signal routing
  • Highlevel input sensitivity up to 14 Volts max.
  • Cable remote control for volume adjustment of the channels C & D optionally available
  • Massive aluminum heatsink for best cooling conditions

Special features:

Smart highlevel input

The latest generation of OE car radios incorporates sophisticated possibilities of diagnosing the connected speakers. If a common amplifier will be hooked up failure messages and loss of specific features (e.g. fader function) quite often appears

The new ADEP circuit (Advanced Diagnostics Error Protection) avoids all these problems without loading the speaker outputs of the OE radio during high volumes unnecessarily.

Class-AB Highlevel-Input ADEP RCA-Input Remmote-Control-ready Active crossover  SMD 

Technical Specs

Output power RMS / max. 
- @ 4 Ohms4 x 65 / 130 Watts
- @ 2 Ohms4 x 90 / 180 Watts
- @ 1 Ohm
- bridged @ 4 Ohms2 x 180 / 360 Watts
- bridged @ 2 Ohms
Amplifier technologyClass AB
Inputs4 x RCA / Cinch
4 x Highlevel speaker input
1 x Remote In
1 x Remote control input
Input sensitivityRCA / Cinch 0.5 - 6 Volts
Highlevel 1 - 14 Volts
Input impedance RCA / Cinch30 kOhms
Input impedance highlevel12 Ohms
Outputs4 x Speaker output
Output voltage RCA / Cinch
Signal converter for digital input
Frequency response10 Hz - 50.000 Hz
Bass boost0 - 12 dB / 45 Hz
Highpass15 Hz - 4,000 Hz adjustable
Lowpass40 Hz - 4,000 Hz adjustable
Bandpass15 Hz - 4,000 Hz adjustable
Slope high- / lowpass12 dB/Oct.
Slope subsonic / lowpass
Signal-to-noise ratio digital input
Signal-to-noise ratio analog input108 dB (A-weighted)
Distortion (THD)0.02 %
Damping factor65
Operating voltage9.6 - 16 Volts
Idle current1000 mA
Fuse2 x 25 A Maxi-fuse (APX)
Additional featuresActive, adjustable crossover, bass boost, input mode switch, highlevel input with automatic turn on function and Advanced Diagnostics Error Protection (ADEP), optional cable remote control
Dimensions (H x W x D)53 x 320 x 230 mm /
2.09 x 12.60 x 9.06”

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