Helix M ONE

Helix M ONE – Compact Class D Mono Subwoofer Amplifier

The M ONE is a small, efficient and very stable monoblock for subwoofers built on current Class D technology. It drives 1-Ohm loads with ease, and its current capability makes it a good match for 2 x 2-Ohm subwoofers with parallel-wired voice coils. A comprehensive, practical feature set and minimal dimensions simplify installation.

Its smart high-level input uses the ADEP circuit (Advanced Diagnostics Error Protection): modern OEM head units diagnose connected speakers, and aftermarket amplifiers can trigger error messages or the loss of functions such as the fader – ADEP prevents this without unnecessarily loading the head unit’s outputs at high volume. The switched-mode power supply keeps the amplifier running when battery voltage drops to 6 V during engine cranking.

Key Features

• High output: 240 W RMS at 4 Ohms, 410 W RMS at 2 Ohms and 600 W RMS at 1 Ohm; up to 720 W RMS at 1 Ohm in typical subwoofer applications
• 1-Ohm stable output stage: extremely stable design with high-current power transistors
• Smart high-level input with ADEP: prevents diagnostic error messages and loss of functions with OEM head units
• Automatic turn-on: via the high-level input
• Integrated active crossover: low-pass, band-pass, subsonic filter and phase control
• Bass boost: 0–12 dB, 25–75 Hz
• Bass remote control: cable remote for subwoofer volume included
• Start-stop capability: operates down to a 6 V supply voltage
• SMD construction: surface-mount technology for minimal space requirements and high reliability
• Compact design: with illuminated HELIX logo; low heat output thanks to high efficiency

Inputs & Outputs

• 2 x RCA inputs
• 2 x high-level speaker inputs
• 1 x remote input
• 1 x remote control input
• Input sensitivity: RCA 0.5–6 V, high-level 1.1–13 V
• Input impedance: RCA 20 kOhms, high-level 13 Ohms
• 1 x speaker output

Power & Amplifier Section

• 1 x 240 W RMS at 4 Ohms (≤1% THD+N)
• 1 x 410 W RMS at 2 Ohms (≤1% THD+N)
• 1 x 600 W RMS at 1 Ohm (≤1% THD+N)
• Maximum output: up to 720 W RMS at 1 Ohm (typical subwoofer application)
• Amplifier technology: Class D
• Frequency response: 10–250 Hz
• Signal-to-noise ratio: 95 dB (A-weighted)
• THD: 0.20%
• Damping factor: 100
• Fuses: 2 x 35 A Maxi fuse (APX)

DSP & Sound Tuning

• Low-pass filter: 50–250 Hz, adjustable
• Band-pass: 10–250 Hz, adjustable
• Subsonic filter: 10–50 Hz, adjustable
• Slopes: subsonic 12 dB/oct., low-pass 24 dB/oct.
• Bass boost: 0–12 dB, 25–75 Hz
• Phase: 0–180°, adjustable

Installation & Connectivity Notes

• Operating voltage: 10.5–16 V, for max. 5 seconds down to 6 V
• Idle current: 650 mA
• Operating temperature range: −40 °C to +70 °C
• SRC.1-MK2 subwoofer remote control is listed as an accessory on the product page

Technical Specifications

* In typical applications as subwoofer amplifier

Scope of Delivery

1 x Amplifier HELIX M ONE
1 x Cable remote control
1 x Mounting material
1 x Instruction manual