Helix AMPLIFY 201 X-OVER - 1-channel amplifier

HELIX AMPLIFY 201 X-OVER

HELIX AMPLIFY – Powerful. Clear. Consistent.
With AMPLIFY, HELIX redefines the standard for modern amplifier design: through a contemporary interpretation of classic concepts. Instead of "one-size-fits-all" solutions, AMPLIFY focuses on specialized models that are precisely tailored to different applications. This stringent philosophy guarantees that each model delivers maximum performance for its intended purpose – while concentrating on the essentials.

The 2 Series marks the entry into the AMPLIFY platform – and simultaneously forms its technical and sonic core. These compact Class D amplifiers combine power, a fully bridgeable multi-channel architecture, and outstanding efficiency with practical integration capabilities. Brilliant and precise highs, controlled mids, and tight, powerful bass – the 2 Series brings all facets of natural and powerful sound to any vehicle with sound quality and performance values far exceeding expectations in its class. Whether as a DIRECT, X-OVER, or DSP version (from summer 2025): everything is offered, from flexible 6-channel configurations for full-range applications to the powerful 1-channel subwoofer powerhouse.

AMPLIFY 201 – The Specialists for Subwoofer Performance

Uncompromising bass power in the smallest of spaces: The AMPLIFY 201 monoblocks are specially designed for use as subwoofer amplifiers and deliver superior performance with high control – ideal for powerful bass reproduction with maximum precision. With up to 750 W RMS at 1 ohm, adjustable subsonic and low-pass filters, and adjustable phase shift in the X-OVER version, or an uncompromisingly pure signal path in the DIRECT version, as well as their compact design, the AMPLIFY 201 amplifiers are the optimal choice for targeted subwoofer upgrades in modern sound systems.

Sound and Performance – Above the Standard

The AMPLIFY 2 series not only stands for perfectly tailored solutions for diverse applications, but also for the clear goal of far exceeding the expectations of their class in terms of sound and performance in each of these applications. All amplifiers in the series offer brilliant sound quality, low distortion, and outstanding signal-to-noise ratios – coupled with bridgeable multi-channel outputs throughout for maximum power and installation flexibility. The result: A series that doesn't define itself by its class, but sets new standards within it – making it the first choice for anyone seeking application-oriented performance without compromise.

AMPLIFY X-OVER – Maximum Flexibility for Classic Upgrades

The AMPLIFY X-OVER models are the ideal solution for conventional sound upgrades with factory radios or aftermarket head units. Switchable high-level and RCA inputs allow seamless integration into a wide variety of system configurations. The high-level input is designed for input voltages up to 32 V and guarantees maximum compatibility with modern factory radios and premium sound systems. In addition, an integrated automatic switch-on function allows the amplifier to be activated via the music signal – without the need for an external remote signal. The active crossover offers precise signal tuning with high-quality 12 dB low-pass and subsonic filters, phase control, an input mode switch, and the option to connect the included remote control. The package is rounded out by the ADEP.3 circuitry, which prevents interference in OEM systems and ensures smooth integration.

Form follows function

The design of the HELIX AMPLIFY 2 Series combines modern functionality with a clean, technical look. The compact dimensions allow for flexible installations, even in tight spaces. A removable cover conceals connections and controls, providing additional protection and creating a clean, high-quality overall appearance. Matte surfaces, precise lines, and a minimalist design language create a stylish, exclusive look that blends seamlessly into any modern vehicle interior.

Features

• Highly efficient subwoofer amplifier with high output power of up to 750 watts RMS @ 1 ohm – perfect for combination with 2 x 2 ohm subwoofers in parallel operation
• Ideal for targeted subwoofer retrofitting of factory sound systems thanks to the integrated, active crossover and heavy-duty stereo high-level input with up to 32 V RMS input sensitivity
• High-level input with ADEP.3 circuitry for interference-free integration into OEM sound systems
• Crossover with low-pass, subsonic, and phase filters for optimal system configuration
• Automatic switch-on additionally via music signal for maximum compatibility with factory sound systems Sound systems
• Very compact design for easy integration even in limited space
• Start-stop capability down to 6V supply voltage for uninterrupted performance
• Advanced Class D concept for high efficiency with minimal heat generation
• Wired remote control for volume control

Technical specifications

• Power RMS ≤ 1% THD+N @ 14.4 V
• @ 4 Ohm 1 x 250 Watt
• @ 2 Ohm 1 x 450 Watt
• @ 1 Ohm 1 x 750 Watt*
• Max. Power: Up to 850 watts RMS @ 1 ohm
• Amplifier technology: Class D
• Inputs: 1 x RCA
• 2 x Line-level speaker inputs
• 1 x Remote In
• 1 x Remote control input
• Input sensitivity: RCA: 0.5 - 6 volts
• Line-level: 3 - 32 volts
• Input impedance: RCA: 8 kOhms
• Line-level: 9 - 33 ohms
• Outputs: 1 x speaker output
• Output voltage: RCA
• Signal converter for the digital input
• Frequency range: 10 Hz - 250 Hz
• Bass Boost 
• High pass 
• Low pass 50 Hz - 250 Hz adjustable
• Bandpass 
• Subsonic 10 Hz - 50 Hz adjustable
• Phase 0° - 180° adjustable
• Slope high/low pass low pass: 12 dB/Oct.
• Slope steepness subsonic 12 dB/oct.
• Slope steepness subsonic / low pass 
• Signal / noise ratio (A-weighted) 114 dB @Maximum power
• Total harmonic distortion (THD @ 1 kHz, 1 W at 4 Ohm) 
• Tonal harmonic distortion (THD+N @ 1 kHz, 1 W into 4 ohms) 
• Tonal harmonic distortion (THD @ 100 Hz, 1 W into 4 ohms) < 0.003%
• Tonal harmonic distortion (THD+N @ 100 Hz, 1 W into 4 ohms) < 0.02%
• Damping factor 200
• Operating voltage 10.5 - 16 volts (max. 5 seconds down to 6 volts)
• No-load current consumption 1,100 mA
• Fuse 2 x 30 A LP mini plug-in fuses
• Power consumption DC 12 V ⎓ 80 A max.
• Ambient temperature range for operation -40 °C to +70 °C
• Additional features Active, adjustable crossover, start-stop capability, high-level input with automatic switch-on, ADEP.3
• Dimensions (H x W x D) 40 x 248 x 114 mm
• * Continuous 1 ohm power with music signal only reached

Scope of delivery

• 1 x HELIX AMPLIFY 201 X-OVER amplifier
• 1 x wired remote control
• 2 x Allen keys
• 1 x connection cable
• 2 x fuses
• 1 x mounting material
• 1 x user manual