Helix M Four (M – Series)

HELIX M FOUR

Compact Power – Precision Performance for Front and Rear Stages

The HELIX M FOUR is a super-compact 4-channel amplifier designed to deliver massive output power with exceptional efficiency and thermal control. With 100 Watts RMS per channel at both 4 and 2 Ohms, it is perfectly suited to power front and rear speaker setups, offering the performance required for a dynamic and clear in-car audio experience.

Thanks to its highly efficient Class D architecture, the M FOUR runs cool under pressure, even while packing serious punch into your speaker system. And if more power is needed, it supports bridged 3-channel or 2-channel configurations, delivering up to 2 x 200 Watts RMS of clean and distortion-free audio.

High Output in a Minimal Footprint

Despite its compact chassis, the M FOUR boasts big amplifier performance, making it the perfect choice for space-conscious installs without compromising on output or sound clarity. The amp’s sleek, minimal design with an illuminated HELIX logo complements any installation, while its low heat generation ensures reliable, consistent performance even in tight, enclosed environments.

Flexible System Configuration with Smart Crossovers

The integrated active crossover section includes highpass, lowpass, and bandpass filters, giving you complete control over how power and frequencies are distributed to your speakers. Whether you’re running full-range systems, component sets, or midbass/subwoofer combinations, the “Input Mode” switch enables flexible signal routing for versatile audio setups.

Smart High-Level Input with ADEP Circuit

Modern vehicles often include diagnostic functions in their OEM radios that can interfere with aftermarket amplifiers. The HELIX M FOUR eliminates these issues with its ADEP (Advanced Diagnostics Error Protection) circuit. This technology allows seamless integration into factory systems by preventing diagnostic errors and maintaining full functionality, such as fader control, without unnecessarily loading speaker outputs at high volume levels.

Start-Stop System Compatibility

Thanks to its regulated Class D power supply, the M FOUR can operate reliably down to 6V—ensuring continued playback even when the vehicle’s engine start-stop system is active. This feature is essential for modern vehicles equipped with voltage-drop-prone systems.

Built to Last – Efficient and Reliable

Using SMD (Surface Mounted Device) manufacturing, the M FOUR offers maximum reliability in a compact form factor. The precision engineering reduces signal loss and interference, allowing the amplifier to deliver pristine sound quality and consistent performance over time.

Special Features

Smart OE Integration with ADEP

The ADEP circuit makes the M FOUR an ideal upgrade for OEM head units. It ensures smooth integration, avoids error messages, and retains vehicle audio functions like the factory fader, even in high-end infotainment systems.

Start-Stop Capability

No interruptions in playback: the amplifier continues running seamlessly even when the battery voltage drops to 6V during engine cranks—a must-have for modern cars with start-stop technology.

High-Efficiency Class D Design

The M FOUR’s efficient power topology minimizes energy waste and heat output, making it ideal for tight installations where cooling space is limited.

Features Summary

• Compact Class D 4-channel amplifier with 100 Watts RMS @ 4/2 Ohms
• Bridgeable to 2 x 200 Watts RMS for 2-channel or 3-channel setups
• Start-Stop system compatible, operates down to 6V
• Smart ADEP high-level input with Auto Turn-On function
• Fully active crossover: highpass, lowpass, bandpass
• Input Mode switch for flexible input signal routing
• SMD-based construction for compactness and reliability
• Ultra-efficient design for low heat dissipation
• Illuminated HELIX logo and sleek enclosure for aesthetic installs