HELIX P TWO - 2-channel High-Res amplifier with integrated, active crossover and digital signal input

Plenty of power and sensitivity – the new P TWO combines two talents in an absolutely unique way. Due to its RMS output power of 2 x 490 Watts into two Ohms, this compact amplifier is able to drive even powerful subwoofers to the max. The technical design is literally predestinated for all woofers with 2 x 2 Ohms dual voice coil like the new HELIX Q subwoofers.

But despite its sheer force the P TWO is by no means a pure subwoofer amplifier. On the contrary, the Ultra HD Class D concept combines an extended frequency response above 40 kHz with high damping factor, minimal distortion and excellent signal-to-noise ratio. Therefore, this amplifier is likewise a perfect buddy for heavy-duty front speakers in audiophile system concepts.


  • “Ultra HD Class D” concept which combines the high-end sound quality of Class AB technology with the benefits of Class D amplifiers
  • Two speaker outputs with 490 Watts RMS each at 2 Ohms
  • Digital, optical signal input in SPDIF format including SPDIF Direct In switch for routing the digital input signal directly to the power stage
  • BurrBrown DA signal converter of the latest generation with a resolution of 32 Bit
  • Integrated, active crossover with highpass, lowpass, bandpass and configurable bass boost
  • Smart highlevel input with ADEP circuit
  • Cable remote control for volume adjustment
  • Compact design with low heat dissipation thanks to extraordinary efficiency


Special features:

Ultra HD Class D amplifier technology

Compared to conventional Class D amps, this concept achieves an extended frequency response to more than 40 kHz in combination with reduced distortion thanks to an advanced integrated feedback design. Ultra HD Class D achieves outstanding, “Class AB-like” sound quality combined with the efficiency of a Class D amplifier.

Signal converters with a native resolution of 32 Bit

The HELIX P TWO uses for the optical input a highclass DA signal converter of the latest generation with a native resolution of 32 Bit instead of the common 24 Bit. The result is an unprecedented precision in signal conversion that especially optimizes the sound quality at lower signal levels.

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 P TWO. 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.

Start-Stop capability

The switched power supply of the HELIX P TWO assures operation even if the battery’s voltage drops down to 6 Volts during engine crank.

Technical data

Output power RMS / max.  
- @ 4 Ohms 2 x 280 / 560 Watts
- @ 2 Ohms 2 x 490 / 980 Watts
- @ 1 Ohm
- bridged @ 4 Ohms
- bridged @ 2 Ohms
Max. output power per channel* Up to 600 Watts RMS @ 2 Ohms
Amplifier technology Ultra HD Class D
Inputs 2 x RCA / Cinch
2 x Highlevel speaker input
1 x Optical SPDIF (28 - 96 kHz)
1 x Remote In
1 x Remote control input
Input sensitivity RCA / Cinch 2 - 8 Volts
Highlevel 5 - 20 Volts
Input impedance RCA / Cinch 10 kOhms
Input impedance highlevel 13 Ohms
Outputs 2 x Speaker output
Output voltage RCA / Cinch
Signal converter for digital input BurrBrown 32 Bit DA converter
Frequency response 10 Hz - 40,000 Hz
Bass boost 0 - 9 dB / 40 Hz - 120 Hz
Highpass 15 Hz - 4,000 Hz regelbar
Lowpass 15 Hz - 4,000 Hz regelbar
Bandpass 15 Hz - 4,000 Hz regelbar
Slope high- / lowpass Butterworth 12 dB/Oct.
Slope subsonic / lowpass
Signal-to-noise ratio digital input 105 dB (A-weighted)
Signal-to-noise ratio analog input 105 dB (A-weighted)
Distortion (THD) < 0.005 %
Damping factor > 200
Operating voltage 10.5 - 16 Volts (max. 5 sec. down to 6 Volts)
Idle current 2400 mA
Fuse 3 x 30 A LP-Mini-fuse (APS)
Additional features Active, adjustable crossover, bass boost, input mode switch, highlevel input with Advanced Diagnostics Error Protection (ADEP), Auto Remote switch, SPDIF Direct In switch, cable remote control for volume adjustment
Dimensions (H x W x D) 50 x 260 x 190 mm /
1.97 x 10.24 x 7.48”

* In typical multi-channel applications (2- / 3-way system + rear + subwoofer)

Scope of delivery

1 x Amplifier HELIX P TWO
1 x Remote control
2 x Allen key
1 x Mounting material
1 x Instruction manual

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