Helix AMPLIFY 201 X-OVER – 24V Edition

Helix AMPLIFY 201 X-OVER – 24V Edition – Mono Subwoofer Amplifier with Crossover for 24 V Vehicles

The AMPLIFY 201 X-OVER – 24V Edition is a monoblock for subwoofer upgrades within the 2-Series, the entry point and technical core of the HELIX AMPLIFY platform, which is offered in DIRECT, X-OVER and DSP variants. It delivers up to 750 W RMS at 1 Ohm, which suits two 2-Ohm subwoofers wired in parallel. This edition is built for trucks, buses and commercial vehicles with 24 V electrical systems, where OEM audio components are often difficult to replace, and is intended for stable output and reliability during long, demanding operation.

As an X-OVER model it is aimed at classic upgrades with factory or aftermarket head units: the high-level stereo input accepts up to 32 V, the amplifier turns on automatically from the music signal, and ADEP.3 prevents error messages in OEM systems. An active crossover with 12 dB low-pass and subsonic filters plus phase control, and an included cable remote for bass level, complete the package.

Key Features

• High output: 250 W RMS at 4 Ohms, 450 W RMS at 2 Ohms and 750 W RMS at 1 Ohm (≤1% THD+N, 28.8 V; continuous 1-Ohm power with music signal only)
• Subwoofer-ready load handling: 1-Ohm capability matches two 2-Ohm subwoofers wired in parallel
• 24 V power supply technology: designed for upgrading truck and bus sound systems
• Factory system upgrades: integrated active crossover and high-level stereo input accepting up to 32 V RMS
• High-level input with ADEP.3: for trouble-free integration into OEM systems without error messages
• Automatic turn-on: activates via the music signal – no separate remote wire needed
• Active crossover: adjustable low-pass, subsonic filter and phase control
• Cable remote: included for subwoofer volume adjustment
• Start-stop capability: tolerates short voltage drops (max. 5 s down to 12 V)
• Class D technology: high efficiency and low heat dissipation
• Removable top cover: conceals all connections and controls for a protected, tidy installation; matte, minimalist styling suited to modern interiors
• Compact chassis: for space-saving installation

Inputs & Outputs

• 1 x RCA input
• 2 x high-level speaker inputs
• 1 x remote input
• 1 x remote control input (for the cable remote)
• Input sensitivity: RCA 0.5–6 V, high-level 3–32 V
• Input impedance: RCA 8 kOhms, high-level 9–33 Ohms
• 1 x speaker output

Power & Amplifier Section

• 1 x 250 W RMS at 4 Ohms (≤1% THD+N, 28.8 V)
• 1 x 450 W RMS at 2 Ohms (≤1% THD+N, 28.8 V)
• 1 x 750 W RMS at 1 Ohm (≤1% THD+N, 28.8 V; continuous 1-Ohm power with music signal only)
• Maximum output: up to 850 W RMS at 1 Ohm
• Amplifier technology: Class D
• Frequency response: 10–250 Hz
• Signal-to-noise ratio: 114 dB (A-weighted) at full power
• THD at 100 Hz (1 W into 4 Ohms): below 0.003%; THD+N below 0.02%
• Damping factor: 200
• Fuses: 2 x 15 A LP-Mini (APS); power rating 24 V DC, 40 A max.

DSP & Sound Tuning

• Low-pass filter: 50–250 Hz, adjustable, 12 dB/oct.
• Subsonic filter: 10–50 Hz, adjustable, 12 dB/oct.
• Phase: 0–180°, adjustable

Installation & Connectivity Notes

• Operating voltage: 21–32 V, for max. 5 seconds down to 12 V
• Idle current: 750 mA
• For 24 V vehicle electrical systems (trucks, buses, commercial vehicles)
• Operating temperature range: −40 °C to +70 °C

Technical Specifications

* Continuous 1 Ohm power achieved only with music signal

Scope of Delivery

1 x Amplifier HELIX AMPLIFY 201 X-OVER – 24V Edition
1 x Cable remote control
2 x Allen key
1 x Connection cable
2 x Fuse
1 x Mounting material
1 x Instruction manual