Helix-Diamond-Velocity Speaker & Amp Combo Road Glide 2015+ SKU: C-15RGHXDA-SYS1



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

This kit comes loaded with all of the top-level gear you need to upgrade your 2014+ Road Glide amplifier and fairing speakers. This is the perfect setup to pair with your favorite lid speakers. 

We Tune Your Bike for You

All Live-Tune enabled systems can be remotely tuned via the internet by one of our professionals. We can tune your bike from anywhere in the world. Why settle for anything less than the best? Our techs set these systems up every day and have tuned thousands of bike audio systems over the years.

Read More About The Live Tune Option Here

Product Description

  • Steel Speaker Grills with Horns Mounted
  • We stamp and mount the RZ75H 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 are 12db crossovers with a much higher power handling and a much more stable output at all volume levels.
  • 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
    There is no need to cut into the factory radio harness to get accessory turn-on power. 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. Comes with a mounting pad making for a beautiful installation in the fairing every time.
  • Plug and Play Speaker Pod Connectors with Extensions|
    Don't cut any wires! We include plug and play connectors for the factory speaker pods in the fairing. This makes the installation easy. Plug into the pods and connect the speaker wire extensions into your new amplifier.
  • Neoprene Speaker Gasket
    It wouldn't make any sense to install the best speakers without properly sealing them into the speaker pods. So we include a unique but straightforward gasket that we have manufactured just for speakers in Harley Davidson applications. The adhesive and the neoprene rubber maintain integrity for years in extreme temperatures.


  • Compatible Year - 2015+
  • Compatible Model - Road Glide
  • Location - Fairing
  • Additional Adapter Required - No
  • Modification Required - Yes, Headlight and pod modification required - Grinf headlight mounting tabs back to mount to allow clearance for amplifier, pod modification with heat gun to allow clearance for magnet
  • Plug & Play - Yes
  • Works with Electric Lid Locks - N/A



  • Helix Components: 2 Years
  • Diamond Audio Components: 1 Year
  • Velocity Components: 2 Years
  • American Hard Bag Components: 5 Years


Water Resistant

Extreme Level Performance

Road Glide

What's Included

  • (1) Helix M FOUR DSP 4-Channel Amplifier with Integrated 10-Channel DSP
  • (1) Pair 6.5" Diamond Audio MSPRO65 pro audio woofers
  • (1) Pair Dual-stage Velocity RZ75H compression horn tweeters
  • (1) Pair Stamped steel, powder-coated Street Glide speaker grills with horn provisions
  • (1) 8 gauge OFC amplifier power kit for Harley Davidsons
  • (1) Set '14 & up Harley factory radio signal interface harness
  • (1) Set '14 & up Harley factory speaker pod interface connectors with extensions
  • (1) Set Neoprene speaker gasket
  • (1) Set CNC machined HDPE horn mounting rings
  • (1) Set Pre-wired OFC tweeter extensions with serviceable quick disconnects


Product Overview

Bold Pro Audio Mid Woofers
The Diamond Audio MSPRO65 6.5" woofers have a better bottom-end response and use a convex cone geometry that increases cone rigidity under load while keeping the moving mass down.

Technical Specifications

  • Model: MSPRO65
  • Power Rating: 200 W RMS/ 400 MAX
  • Sensitivity: 97dB 1W/1M
  • Frequency Response: 110Hz-10k Hz+/-3dB
  • Nominal Impedance: 4ohm
  • Mounting Depth: 2.375"
  • Cut-out Diameter: 5.625"
  • Over-all Diameter: 6.5"
  • Over-all Height: 2.5625"


Product Overview

Magic Compression Horns
The Velocity RZ75H is a dual-stage horn design with a much smoother sound and the full format diaphragm is large and robust. The magnet is in front of the diaphragm, and the voice coil is on the front side of the diaphragm.

Technical Specifications

  • Model: RZ75H
  • Overall Diameter: 2.28"
  • Cut-Out Diameter: 1.61"
  • Over-All Depth: 2.0"
  • Mounting Depth: 1.12"
  • Sensitivity: 10 dB 1W/1M
  • Frequency Response: 2k - 20k
  • Nominal Impedance: 4ohm
  • Power Handling: 50W RMS / 100W Max
  • Included Crossover: 12db


Product Overview

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 135 Watts per channel, both at 4ohms and 2ohms.

Technical Specifications

  • 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: 20 Hz-22,000 Hz
  • DSP resolution: 64 Bit
  • DSP power: 295MHz
  • Sampling rate: 48kHz
  • DSP Type: Audio signal processor
  • Damping factor: 100
  • Operating voltage: 10.5-16 Volt (max. 5 sec. down to 6 Volts)
  • 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”