Musway M4+ Harley Amplifier and DSP Combo SKU: M4+



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

The Musway M4+ Amplifier Is an Outstanding Performer That Swings Value in Every Direction

Simpler and better in every way. The powerful M4+ combinds a 4 x 100/135 Watt amplifier with a killer 8 channel DSP into one elegant chassis. This greatly simplifies installation and required cables. By combining an amplifier and DSP you eliminate all RCA connections for the 4 internal channels, you eliminate the DSP to amplifier remote turn on wiring, and you eliminate the need to run a dedicated power, accessory, and ground circuits for the DSP.

Perfect for Harley

The M4+ has balanced high level inputs with load compensation that work perfectly with factory Harley radios. These amplifiers integrate seamlessly with all 2014 and later factory radios and also work perfectly with aftermarket radios as well. These amplifiers have a super wide input sensitivity and can accept all of the input signal that your radio has to offer. Integrated signal clip lights eliminate the need for any special test equipment when setting gains.


Product Description

Rock Solid PC Interface

We love the Musway software. All adjustments are made on a single screen and are very straight forward. The software runs from a single file so there is nothing to permanently install on your computer.

Available Remote Support

Never get stuck! We offer remote PC connection support for setting up your Musway M4+. So there is no need to worry about getting it right. We can check every detail for you. Windows PC and an internet connection are required.


  • Drop in fit on top of radio for all 2014 and later Street Glide & Electra Glide
  • Light Modification Required for 2015 and later Road Glide. Headlight mounting brackets need to be shaved back slightly and then it fits nicely under the radio. Additional Velocity RZA500.2 amplifiers can then be mounted on each side of the radio as well. 
  • Friendly to mount in bags for Road Kings


  • 1 Year Limited


Extreme Level Performance

Road Glide

Street Glide

Check Out The Software Here

Its easy to use and very capable

Remote Support Made Easy - So No Need to Worry About Setup

Once you get your M4+ installed you can always call us for guidance or a second opinion on your settings. We offer remote PC connection using TeamViewer, so we can actually see and control your PC remotely. We do not offer Mac support though.

  • Very Easy to Use
  • Rock Solid PC Interface
  • Powerful Onboard Amplifier
  • Easy to Install with Limited Connections
  • Supports Additional External Amplifiers
  • Harley Charging System Friendly

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


  • 4 x 135 Watts RMS @ 4/2  Ω or
  • 2 x 270 Watts RMS @ 4  Ω bridged
  • 6 x High Level Input
  • 2 x AUX/RCA Input, 1 x Optical Input/Stereo
  • 4 x Loudspeaker Output amplified
  • 4 x Pre-Amplifier Output/RCA (configurable via DSP)
  • Dimensions: 220 x 44 x 150 mm, 8.66" x 1.73" x 5.9"

What's Included

  • Amplifier/DSP
  • DSP Software
  • Optional Plug & Play Wire Harnesses (signal input connections, speaker output connections, power connections and cables, saddlebag speaker harness with disconnects, acessory power input).
  • Optional Flash Tool

What's Not Included

  • Speakers