Helix M FOUR 4-Channel Amplifier with Integrated Active Crossover SKU: M FOUR



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Expanded Audio Features Combined with Ridiculous Power and Intelligence from Helix

If you're a fanatic for amazing sound, the Helix M FOUR is precisely the right way to go. This amplifier will fire up your speakers in no time with an abundant 135 Max Watts RMS per channel on a scaled-down footprint. Perfect for integration with factory Harley radios, the M FOUR has many features distinguishing it from any other amps ever conceived.

Tap Into Your Factory Radio For a Clean, Well-Defined Sound

The M FOUR is equipped with many intelligent attributes to help it quickly adjust to all installation challenges of modern factory Harley radios. The extensive audio features will offer a sound quality at its best.

This Amplifier is Totally Cool

The M FOUR stays cool thanks to the highly efficient Class D design topology, allowing you to listen for many hours without overheating while it delivers up to 540 Watts of clean and undistorted output power.


    • Compatible Year - 2014+
    • Compatible Model - Street Glide, Road Glide
    • Location - Fairing
    • Additional Adapter Required - Yes
    • Modification Required - Street Glide No, Road Glide Yes - Headlight modification and mounting bracket - Grind headlight mounting tabs back to mount to allow clearance for amplifier
    • Plug & Play - No
    • Works with Electric Lid Locks - N/A


1 year


Extreme Level Performance

Road Glide

Street Glide

  • Integrated, Adjustable Crossover: highpass, lowpass, and bandpass
  • Input Mode Switch makes for flexible input signal routing
  • Automatic Turn-On Function
  • Compact footprint
  • High output power of 135 Watts RMS
  • Intelligent high-level input makes for easy integration into factory Harley radios
  • Surface Mounted Device manufacturing technology combines minimum space with maximum reliability
  • Exclusive clean and efficient design


  • Output Power RMS: 4 x 100W @4 Ohms; 4 x 100W @2 Ohms; 2 x 200W Bridged @4 Ohms
  • Max Output Power/Channel: 135W RMS @2 Ohms
  • Amplifier Technology: Class D
  • Inputs: 4x RCA; 4x High-Level Speaker Input; 1x Remote In
  • Input Sensitivity: RCA 0.5-6V; High Level 1.3-13V
  • Input Impedance: RCA 20 kOhms; High Level 13 Ohms
  • Outputs: 4x Speaker Output
  • Frequency Response: 10 Hz-30,000 Hz
  • Highpass: 15 Hz-4,000 Hz adj; Lowpass: 40 Hz-4,000 Hz adj; Bandpass: 15 Hz-4,000 Hz adj
  • Slope High/Lowpass: 12 dB/Oct
  • Signal-to-Noise Ratio: 98 dB
  • Distortion (THD): 0.05 %
  • Damping Factor: 100
  • Operating Voltage: 10.5-16V (Max. 5 sec. down to 6V)
  • Fuse: 2 x 30A Maxi-fuse (APX)
  • Dimensions: 2.00" H x 9.06" W x 6.06” D

What's Included

  • (1) 4-Channel Amplifier with Integrated Active Crossover
  • (1) Pair Front Speaker Pod Connectors
  • (1) Remote Wire
  • (1) Pair Signal Input Wire 
  • (1) Mounting Pad with Adhesive
  • (1) Instruction Manual