HELIX D FOUR
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!
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 - 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.
Technical data
| 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 | - |
| Max. output power per channel* | Up to 160 Watts RMS @ 2 Ohms |
| Amplifier technology | Class AB |
| Inputs | 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 |
| Outputs | 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 |
| Highpass | 15 Hz - 4,000 Hz adjustable |
| Lowpass | 40 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 | 108 dB (A-weighted) |
| Distortion (THD) | 0.02 % |
| Damping factor | 65 |
| Operating voltage | 9.6 - 16 Volts |
| Idle current | 1000 mA |
| Fuse | 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” |
* In typical multi-channel applications (2- / 3-way system + rear + subwoofer)
Scope of delivery
1 x Amplifier HELIX D FOUR
1 x Mounting material
1 x Instruction manual
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