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Helix-Diamond Speaker & Amp Combo Upgrade Harley Road Glide 2015+


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This kit comes loaded with all of the top-level gear you need to upgrade your 2015+ Road Glide and is fully plug-and-play. 


Magic Compression Horns

The Diamond Audio M075T is a dual-stage horn design that has a much smoother sound. The full format diaphragm is large and robust and allows for extreme level output volumes. The magnet is in front of the diaphragm and the voice coil is on the front side of the diaphragm which allows for a much more compact horn design that easily fits in front of the midrange.

Bold Pro Audio Mid Woofers

The Diamond Audio MSPRO65 6.5" woofers have a better bottom-end response. The convex cone geometry increases cone rigidity under load while keeping the moving mass down. Installation Note: The factory speaker pods in the fairing require a light modification for magnet clearance. Simply heat the plastic speaker pod with a heat gun around the area where the magnet touches and screw the speaker in place. The plastic will then conform to shape allowing the speaker to fit perfectly.

Steel Speaker Grills with Horns Mounted

We stamp and mount the M075T horns for you. Black coated stainless steel fasteners are used and a CNC machined HDPE backplate so that the speaker grills match the integrity of the rest of the bike.

12db Crossovers Add a Lot to Performance and Reliability

The crossovers included in this kit though are 12db crossovers with a much higher power handling and more stable output at all volume levels.

Helix M FOUR DSP 4-Channel Amplifier with Integrated 10-Channel DSP

The Brand New Helix M FOUR DSP is a powerful 4-channel amplifier with a fully integrated digital sound processor that brings a continuous output of 135w per channel, both at 4ohms and 2ohms.

Factory Harley Radio Interface for Front Signal Included

Plug-and-play connections are included with this amplifier. The Helix M Four DSP amplifier has an advanced radio load compensation circuit built-in. 

Factory Harley Accessory Power Interface Included

A plug-and-play connection and cable are included.

Premium 8 Gauge Power Harness

The included power harness is 100% OFC (oxygen-free copper). The ANL fuse holder is waterproof and install-friendly. The power cables have been pre-terminated, heat shrunk and loomed for you, and comes with a mounting pad.

Plug and Play Speaker Pod Connectors with Extensions

We include plug-and-play connectors for the factory speaker pods in the fairing. Simply plug into the pods and connect the speaker wire extensions into your new amplifier.

Neoprene Speaker Gasket

We include a simple gasket that we have manufactured just for speakers in Harley applications. The adhesive and the neoprene rubber maintain integrity for years in extreme temperatures.

Specifications - Amplifier/DSP:

  • Model: M FOUR DSP
  • Power RMS: @ 4ohms: 4 x 135w; @ 2ohms: 4 x 135w; Bridged @ 4ohms: 2 x 270w
  • Amplifier Technology: Class D
  • Inputs: 6x RCA, 6x High-level speaker, 1x Optical SPDIF, 1x Remote In
  • Input sensitivity: RCA 1-4 V, Highlevel 5-20 V
  • Input impedance RCA: 22kOhms
  • Input impedance high-level: 9-33ohms
  • Outputs: 4x Speaker, 6x RCA, 2x Remote Out
  • Output voltage RCA: 6 Volts RMS
  • Frequency response: 20Hz-22,000Hz
  • DSP resolution: 64 Bit
  • DSP power: 295MHz
  • Sampling rate: 48kHz
  • DSP Type: Audio signal processor
  • Signal converters: A/D: AKM 32 Bit, D/A: AKM 32 Bit
  • Damping factor: 100
  • Operating voltage: 10.5-16 Volt (max. 5 sec. down to 6 Volts)
  • Idle current: 1500 mA
  • Max. remote output voltage: 500 mA
  • Fuse: 2x 30A LP-Mini-Fuse
  • Additional features: ADEP.3 circuit, Auto Remote switch, 32 Bit CoProcessor, Control Input
  • Dimensions (H x W x D): 2.0” x 9.06” x 6.06”

Specifications - Woofers:

  • Model: MSPRO65
  • Power Rating: 200w RMS/ 400 MAX
  • Sensitivity: 97dB 1W/1M
  • Frequency Response: 110Hz-10k Hz+/-3dB
  • Nominal Impedance:  ohm
  • Mounting Depth: 2.375"
  • Cut-out Diameter: 5.625"
  • Over-all Diameter: 6.5"
  • Over-all Height: 2.5625"

Specifications - Compression Horn Tweeters:

  • Model: M075T
  • Overall Diameter: 2.28"
  • Cut-Out Diameter: 1.61"
  • Over-All Depth: 2.0"
  • Mounting Depth: 1.12"
  • Sensitivity: 106dB 1W/1M
  • Frequency Response: 2k - 20k
  • Nominal Impedance: 4ohm
  • Power Handling: 50W RMS / 100W Max
  • Included Crossover: 12db

Included in This Kit:

  • Helix M FOUR DSP 4-Channel Amplifier with Integrated 10-Channel DSP
  • 6.5" Diamond Audio MSPRO65 pro audio woofers
  • Dual-stage Diamond Audio M075T compression horn tweeters 
  • Stamped steel, powder-coated Road Glide speaker grills with horn provisions
  • 8 gauge OFC amplifier power kit for Harley Davidsons
  • 2014+ Harley factory radio signal interface harness
  • 2014+ Harley factory speaker pod interface connectors with extensions
  • Neoprene speaker gasket
  • CNC machined HDPE horn mounting rings 
  • Pre-wired OFC tweeter extensions with serviceable quick disconnects


Fits 2015+ Road Glide. Requires slight modification to headlight bracket and headlight plastic mounting tabs. Will not fit in the fairing of '13 and down Road Glide or Street Glide.

Works with all radio flashes, factory and aftermarket.



    Shipping This Item Ships to The United States 

    Items built to order have a build time of up to two weeks before shipping. Items that are not built to order (e.g. amplifiers, speakers, .etc) typically ship in 2 - 3 business days. Many of our speaker kits feature machined special parts and customized wire harnesses that are built to order. We process and build orders in the order that we receive them. This allows our experts to go over every order and check that your particular order is correct for your particular bike. This means sometimes you have to wait a little longer to get your order but it's always worth it! 

    Once You Order Does Ship

    You will receive an automated email with tracking information as soon as our shipping department creates a shipping label for your package.  


    There are many more speakers, amplifiers, and kits to choose from than what you see here.

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    Please allow 10 business days for your order to arrive if it is an item that is built to order. Items that are not built to order (e.g. amplifiers, speakers, .etc) typically ship the next business day.We process and build orders in the order that we receive them. This allows our experts to go over every order and check that your particular order is correct for your particular bike. This means sometimes you have to wait a little longer to get your order but it's always worth it! 

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    Easy Returns

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