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

Regular price $499.99 $399.99


Free System Design Call Now 1(888)311-0016

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

Free Radio Flash Loaner Tool

Flash Your Bike Yourself and Be Sure That the Job Is Done Right

Our flash tool rental kit ships with all of the parts required to flash any Harley touring bike radio from 2014 - current year. The kit ships with a return shipping label for your convenience. After you are finished with the tool simply drop it in the mail and receive a full refund for your $200 deposit.

$120.00 Value! 

Read all of the details here


  • 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