• 4-channel high- and low level input
• Smart high level input with ADEP circuit (Advanced Diagnostics Error Protection) and Auto Turn-On function
• Fully active crossover with high pass, lowpass, bandpass and bass boost
• Extremely stable MOSFET power supply
• “Input mode” switch for flexible input signal routing
• High level 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

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The new HELIX D amplifiers open new horizons in terms of price performance ratio. It is the first time that HELIX offers a lot of amplifier performance for such a low budget without neglecting the proved HELIX quality. Both power packs convince at first sight through high-quality processing in many details. The fine brushed aluminum heatsink and the stylish HELIX-logo make these models very attractive.

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 – but not with the D FOUR.
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.


Output power RMS / max.

– @ 4 Ohms

4 x 65 / 130 Watts

– @ 2 Ohms

4 x 90 / 180 Watts

– @ 1 Ohm

– bridged @ 4 Ohms

2 x 180 / 360 Watts

– bridged @ 2 Ohms

Amplifier technology

Class AB


4 x RCA / Cinch

4 x Highlevel speaker input

1 x Remote In

1 x Remote control input

Input sensitivity

RCA / Cinch 0.5 – 6 Volts

Highlevel 1 – 14 Volts

Input impedance RCA / Cinch

30 kOhms

Input impedance highlevel

12 Ohms


4 x Speaker output

Output voltage RCA / Cinch

Signal converter for digital input

Frequency response

10 Hz – 50.000 Hz

Bass boost

0 – 12 dB / 45 Hz


15 Hz – 4,000 Hz adjustable


40 Hz – 4,000 Hz adjustable


15 Hz – 4,000 Hz adjustable



Slope high- / lowpass

12 dB/Oct.

Slope subsonic / lowpass

Signal-to-noise ratio digital input

Signal-to-noise ratio analog input

108 dB (A-weighted)

Distortion (THD)

0.02 %

Damping factor


Operating voltage

9.6 – 16 Volts

Current draw

1000 mA


2 x 25 A Maxi-fuse (APX)

Additional features

Active, 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”