OverDrive 2015+ Diamond Audio - Velocity Road Glide Speaker Kit SKU: SPK-15-RG-OverDrive-D



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This is the best sounding and loudest Harley Road Glide speaker kit. If you are looking for the very best this is the kit for you. This kit comes with steel replacement speaker grills with Velocity RZ75H horns mounted in them for you. The RZ75H is by far the very best compression horn tweeter on the market. It has a wider frequency response due to its dual stage horn flare and 12db passive crossovers instead of the industry standard single stage flare and 6db per octave crossovers. The included Diamond Audio MSPRO65 6.5” midrange drivers are also top of the line and produce a better mid-bass punch and smoother upper frequency response than all other 6.5” speakers available. This kit is plug and play and comes with everything that you need to upgrade your 2015 and later Harley Road Glide fairing speaker system.

Pro Tune Kit Included!

This speaker kit includes a Pro Tuning kit. This dramatically simplifies tuning your Harley sound system by giving you an accurate visual display of what your sound system is doing in real time. See the video for more information.

The Pro Tune kit comes with
  • A test microphone with calibration file
  • A USB drive that is loaded with a test track for the microphone
  • A microphone selfie stick adapter to hold the microphone in the correct position


  • Compatible Year - 2015+
  • Compatible Model - Road Glide
  • Location - Fairing
  • Additional Adapter Required - No
  • Modification Required - Light
  • Plug & Play - YES!

NOTE: The factory fairing speaker pods must be modified slightly using a heat gun in order to make clearance for the woofer magnet inside the pod. This is a very simple procedure. Heat the pod where the magnet makes contact until the plastic is soft and then simply screw the speaker in place.


  • 2 Years on Velocity OverDrive parts and horns
  • 1 Year extended warranty (3 years total) on Velocity OverDrive parts if installed by an authorized Velocity Speaker Design installer. 
  • 1 year on all Diamond Audio parts


Water Resistant

Extreme Level Performance

Road Glide

Extreme Output & The Best Sound Quality
Step into the top level of pro audio Road Glide speakers. This kit includes everything that you will need to add Velocity RZ75H horns and MSPRO65 mid-woofers to your '15 & up Road Glide. This is a whole new level of loudness and sound quality that simply has not been possible up until now. 

Easy Installation
We include several parts in this kit that make installation a snap. Included are quick disconnect harnesses for each of the horns and crossovers. The included speaker grills snap right in place of the original factory grills. Each horn comes with a CNC machined HDPE backplate. All fasteners are stainless steel. The woofers are plug-and-play with the factory Harley speaker wiring. 

IP65 Marine Grade Speakers
These speakers are designed to take all of the weather that you can throw at them. They are treated for extreme UV exposure, extreme swings in temperature, high vibration, and water.


Velocity RZ75H Compression Horn Tweeters

  • Sensitivity: 105dB 1W/1M
  • Frequency Response: 2.5k - 20kHz
  • Nominal Impedence: 4ohm
  • RMS/MAX: 50W/100W
  • FS: 1.71khz
  • Over-All Diameter: 2.95"
  • Over-All Depth: 1.57"
  • Cut-Out Diameter: 2.0"
  • 12 dB Crossover

Diamond Audio MSPRO165 Mid Range

  • Size mm (in.) 165 (6.5)
  • Power Handling - Peak W 400
  • Power Handling - Continuous W 200
  • Impedance Ω 4
  • Frequency response Hz 100 ÷ 10k
  • Sensitivity dB SPL 97
  • Voice coil Ø mm (in.) 38,6 (1.5)
  • Magnet Neodymium
  • Cone/Dome Water repellent pressed paper

What's Included

  • MSPRO65 MidWoofers
  • OverDrive Dual Stage Horns
  • 12dB Crossovers
  • Road Glide Specific Speaker Grills
  • CNC Machined Horn Mounting Rings
  • Blacked Out Stainless Hardware
  • Pro Tune Kit!

What's Not Included

  • Amplifier - This speaker kit is designed to be used with aftermarket amplifiers
  • DSP - This speaker kit is designed to be used with aftermarket digital sound processors (equalizer)


Product Overview

Diamond Audio MSPRO65 Mid Woofers Are the Way to Go. 
These woofers have a lot in common with other pro audio type woofers out there but they have a few tricks up their sleeve that is easy to miss if you don't know what you are looking at. The cone shape has a convex geometry that dramatically improves cone stiffness, efficiency (loudness per watt), and amplifies/smooths the high-frequency response. Couple all of that with a 400-watt thermal spec and you get a wall of volume that simply sounds better than everything else out there.

Technical Specifications

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


Product Overview

Velocity RZ75H Horns Are the Best Sounding Horns Out There.
We auditioned all of the popular horns on the market alongside these and nothing else compares. The dual-stage horn flare, inverted neo magnet/diaphragm, and refined phase plug design outperforms other bullet-style horns by leaps and bounds.

Technical Specifications

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

12db Crossovers

Product Overview

12db Crossovers Add a Lot to Performance and Reliability. 
Most of the horns on the market come with 6db caps for crossovers. Those types of crossovers have a lot of problems though. The sound of a horn using just a cap changes dramatically with volume, making it impossible to tune your system to sound equally as good at high volume as lower volumes. The crossovers included in this kit though are 12db crossovers with a much higher power handling and a much more stable output at all volume levels.


The included croosovers are now fully plug and play with your factory Harley wire harness, speaker pods, and American Hard Bag plug & play amplifier wire harnesses.