Plug & Play Musway M4+ Four Channel Amplifier with 8 Channel DSP Harley Package SKU: C-M4+14FRT-Techno-14/20

Regular price $1,099.98 $979.99


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This True plug-and-play amplifier/DSP package includes an unprecedented level of pre-configured equipment. We have included a Techno Research radio flash module with this kit. Now you will be able to flash your bike for any configuration you want any time you want! The flash module also will enable Apple CarPlay for free without the need for any special parts. The module will be VIN locked to your bike. 

The M4+ has everything you need for a truly elegant audio system whether you are going basic or going huge. This amplifier integrates flawlessly with the factory Harley Davidson radios and has plenty of onboard power to drive most any speaker system. No clicks, pops, or distortion problems. The M4+ has a built-in system that loads your factory radio's outputs so that your radio performs as if the factory speakers were still in play. This dramatically improves sound quality and eliminates unwanted noises and distortion in the audio.

  • Retains Factory Fader, Hand Controls, and Intercom
  • Harley Charging System Friendly 
  • Properly Loads Factory Radio Outputs

The onboard amplifier is a very capable 4 x 100 Watts at 4 ohms. We have found this amplifier to be much more capable than other 100 Watt per channel amplifiers. Not all 100 Watt amplifiers are equal! The Musway M4+ has a superior design that allows the amplifier to push the limits of performance under less than ideal conditions where other amplifiers would fall on their face. When it comes to real-world performance, this amplifier just can not be compared to other amplifiers that claim the same numbers. 


  • Compatible Year - 2014+
  • Compatible Model - Street Glide, Road Glide
  • Location - Fairing
  • Additional Adapter Required - No 
  • Modification Required - No
  • Plug & Play - Yes
  • Works with Electric Lid Locks - N/A

Flash Module Notes: The radio flash module comes in two flavors. Either 2014 through 2020, or 2021 and newer. The software and module are the same but the cable that comes with the module to connect to your bike is for one year range or the other. If you decide that you want to use your module to flash a second bike, you can call TechnoResearch and purchase a second license for $50 and if you need the cable for the other year range, you can purchase that as well. Flash as many bikes as you like by simply purchasing a license for each bike as you go. 


1 year


Road Glide

Street Glide

4 Rca Outputs With Dedicated Dsp Lets You Add More Amplifiers
The M4+ is a lot more than a 4 channel amplifier. It is the perfect centerpiece to build a large-scale system around. With 4 channels of 6 volt RCA output, you can go wild with multi amplifier systems. 

  • Intelligent high level input with EPS (Error Protection System)
  • Soft clipping in 2 Ω operation
  • Signal-to-noise ratio ≥90dB, frequency response 15 Hz - 22 kHz (-3dB)
  • Total harmonic distortion ≤0.1% (1 kHz, 4Ω, 90% power)
  • Separately adjustable input sensitivity (channels 1-6, AUX), clipping LED
  • Dual 32bit, 330 MIPS DSP technology controllable via PC software or APP
  • External Bluetooth® USB dongle ( BTS & BTA ) for audio streaming & app control (optional)

Built-In Dual 32 Bit DSP
We are in love with the Musway sound processor software. It is beautifully laid out and easy to use. Musway did a fantastic job with including all of the right bells and whistles but still keeping the interface and learning curve simple. The DSP can be accessed by connecting the included USB cable to your PC or by using the optional Bluetooth adapter (available late September) to connect to your smartphone (Android or Apple).


  • 4 x 100/135 watts RMS @ 4/2 Ω or
  • 2 x 270 watts RMS @ 4 Ω bridged
  • 6 x high level input
  • 6 x RCA low level input *
  • 2 x AUX / RCA inputs
  • 1 x input optical / stereo
  • 4 x amplified loudspeaker output
  • 4 x preamplifier output / RCA (configurable via DSP)
  • Dimensions: 150 x 44 x 220 mm

What's Included

  • Radio Flash Module ('14 through '20 or '21 and later)
  • Harley Radio T Harness (plug & play for all '14 and up bikes)
  • Harley Specific Plug & Play Accessory Power Harness 
  • USB Thumb Drive with Speaker Settings, Installation Articles, Test Track, and Software.
  • 4 x 100/135 Watts RMS of Onboard Power
  • 8 Channels of DSP (4 internal & 4 RCA outputs)
  • Amplifier Mounting Pad