Product overview
HELIX AMPLIFY – Power. Clarity. Purpose.
With the AMPLIFY series, HELIX redefines the idea of modern amplifier design – by reinterpreting classic concepts through the lens of today’s audio demands. Rather than designing one amplifier to do everything, the focus lies on specialized models, each tailored for a specific type of application. This clear philosophy ensures every variant delivers exactly what’s needed – and nothing you don’t.
HELIX AMPLIFY – Power. Clarity. Purpose.
The 2-Series marks the entry into the AMPLIFY platform – and forms its technical and tonal core. These compact Class D amplifiers combine powerful performance, a fully bridgeable multi-channel architecture, and excellent efficiency with seamless real-world integration. Brilliant and precise treble, a controlled mid-range as well as tight, powerful bass – the 2-Series brings out every nuance of natural, powerful sound, outperforming the expectations of its class in both sound quality and output. Whether as a DIRECT, X-OVER, or DSP variant: from flexible 6-channel setups for fullrange applications to dedicated mono powerhouses for subwoofers – the 2-Series offers tailored solutions for every configuration.
AMPLIFY 201 – The specialists for subwoofer performance
Uncompromising bass power in a compact format: The AMPLIFY 201 monoblock amplifiers are specifically designed for subwoofer upgrades and deliver powerful output with excellent control – ideal for deep, dynamic bass with maximum precision. With up to 750 W RMS at 1 Ohm, adjustable subsonic and lowpass filters, and phase control in the X-OVER version – or an uncompromised signal path in the DIRECT model – along with their compact footprint, the AMPLIFY 201 amplifiers are the perfect choice for targeted subwoofer upgrades in modern sound systems.
Sound and power – above the standard
The AMPLIFY 2-Series is more than just a range of application-specific solutions – it's a clear commitment to a very specific mission: to outperform expectations in each of those applications – both in sound quality and power delivery. All amplifiers in the series offer brilliant sound performance, minimal distortion, and an outstanding signal-to-noise ratio – combined with fully bridgeable multi-channel outputs for maximum output and installation flexibility. The result: a lineup that doesn’t define itself by its class, but sets new benchmarks within it – making AMPLIFY the first choice for those seeking application-focused performance without compromise.
AMPLIFY X-OVER – Maximum flexibility for classic upgrades
X-OVER models are the ideal choice for traditional sound upgrades using factory or aftermarket radios. Switchable high-level and RCA inputs allow seamless integration into a wide range of system configurations. The high-level input is designed for input voltages up to 32 V, ensuring maximum compatibility with modern factory head units and premium sound systems. In addition, an integrated auto turn-on function enables the amplifier to also be activated via the music signal – without the need for a separate remote line. The integrated active crossover enables precise signal tuning, by offering high-quality 12 dB lowpass and subsonic filters, phase control, an Input mode switch and an included remote control option. In addition, the integrated ADEP.3 circuit prevents error messages in OEM systems, making X-OVER models a versatile and integration-friendly solution
Form follows performance
The design of the HELIX AMPLIFY 2-Series blends modern functionality with a refined, technical aesthetic. Its compact dimensions allow for flexible installation, even in tight spaces. A removable top cover conceals all connections and controls, offering additional protection as well as a clean and streamlined appearance that highlights the amplifier’s high-quality character. Matte surfaces, sharp contours, and a minimalist design language create a sleek, exclusive look that integrates seamlessly into any modern vehicle interior.
Key features
- Highly efficient subwoofer amplifier with high output power of up to 750 Watts RMS @ 1 Ohm – a perfect match for all 2 x 2 Ohms subwoofers connected in parallel
- Ideal for subwoofer upgrades of factory sound systems thanks to integrated, active crossover and high power stereo highlevel input with up to 32 V RMS input sensitivity
- Highlevel input with ADEP.3 for trouble-free integration into OEM sound systems
- Crossover with lowpass, subsonic and phase for optimal system configuration
- Additional auto turn-on via music signal for maximum compatibility with factory sound systems
- Very compact design for space-saving installation
- Start-stop capability down to 6V supply voltage for uninterrupted performance
- Advanced Class D concept for high efficiency and low heat dissipation
- Cable remote control for volume adjustment
Technical specifications
| Technical data | |
|---|---|
| – @ 4 Ohms | 1 x 250 Watts |
| – @ 2 Ohms | 1 x 450 Watts |
| – @ 1 Ohm | 1 x 750 Watts* |
| – bridged @ 4 Ohms | – |
| – bridged @ 2 Ohms | – |
| Max. output power | Up to 850 Watts RMS @ 1 Ohm |
| Amplifier technology | Class D |
| Inputs | 1 x RCA / Cinch | 2 x Highlevel speaker input | 1 x Remote In | 1 x Remote control input |
| Input sensitivity | RCA / Cinch: 0.5 – 6 Volts | Highlevel: 3 – 32 Volts |
| Input impedance | RCA / Cinch: 8 kOhms | Highlevel: 9 – 33 Ohms |
| Outputs | 1 x Speaker output |
| Output voltage RCA / Cinch | – |
| Signal converter for digital input | – |
| Frequency response | 10 Hz – 250 Hz |
| Bass boost | – |
| Highpass | – |
| Lowpass | 50 Hz – 250 Hz adjustable |
| Bandpass | – |
| Subsonic | 10 Hz – 50 Hz adjustable |
| Phase | 0° – 180° adjustable |
| Slope high- / lowpass | Lowpass: 12 dB/Oct. |
| Slope subsonic | 12 dB/Oct. |
| Slope subsonic / lowpass | – |
| Signal-to-noise ratio (A-weighted) | 114 dB @ full power |
| Distortion (THD @ 1 kHz, 1 W into 4 Ohms) | – |
| Distortion (THD+N @ 1 kHz, 1 W into 4 Ohms) | – |
| Distortion (THD @ 100 Hz, 1 W into 4 Ohms) | < 0.003% |
| Distortion (THD+N @ 100 Hz, 1 W into 4 Ohms) | < 0.02 % |
| Damping factor | 200 |
| Operating voltage | 10.5 – 16 Volts (max. 5 sec. down to 6 Volts) |
| Idle current | 1,100 mA |
| Fuse | 2 x 30 A LP-Mini-fuse (APS) |
| Power rating | DC 12 V ⎓ 80 A max. |
| Operating temperature range | -40 °C to +70 °C |
| Additional features | Active, adjustable crossover, Start-Stop capability, highlevel input with automatic turn-on function, ADEP.3 |
| Dimensions (H x W x D) | 40 x 248 x 114 mm / | 1.58 x 9.76 x 4.49” |
| Product properties | |
| Dimensions – width | < 250 mm, < 300 mm, < 350 mm, < 400 mm, < 450 mm |
| Dimensions – depth | < 150 mm, < 200 mm, < 250 mm, < 300 mm, < 350 mm, < 400 mm, < 450 mm |
| Dimensions – height | < 50 mm, < 60 mm |
| Output power @ 4 Ohms | > 30 Watt, > 50 Watt, > 70 Watt, > 100 Watt, > 200 Watt |
| Output power @ 2 Ohms | > 30 Watt, > 50 Watt, > 70 Watt, > 100 Watt, > 200 Watt, > 400 Watt |
| Output power @ 1 Ohm | > 100 Watt, > 200 Watt, > 300 Watt, > 500 Watt, > 700 Watt |
| Load stability | 1 Ohm, 2 Ohm, 4 Ohm |
| Signal-to-noise ratio | > 80 dB, > 85 dB, > 90 dB, > 95 dB, > 100 dB, > 105 dB |
| THD | < 0,01 %, < 0,05 %, < 0,1 %, < 0,2% |
| Advanced features | ADEP highlevel input, Auto remote switch, Including remote control, Start-Stop capability |
What you are ordering
The exact HELIX model shown above, APEX catalogue SKU AC20120. Review the listed inputs, outputs, impedance and system requirements before ordering.
Technical information verified against the official Audiotec Fischer product page.
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