Helix-Velocity DSP Amp + 6.5" Coax Speakers

Regular price $1,399.98 $1,349.98


Introducing the Velocity/Helix Difference. A powerhouse combo sure to make you the loudest, best-sounding bike on your ride. This combo comes with a Helix M Four DSP and a set of industry-leading Velocity 6.5" coax speakers.


  • Drop-in fit for all batwing fairing (Street Glide, Electra Glide, Ultra) 2014 - current year 
  • 98-13 batwing needs 5.25" to 6.5" adapter
  • 2015 and later Road Glides require a light modification to the fairing speaker pods with a heat gun. 
  • Fits 6.5" Lower fairing pods that have a depth of 3-3/16 in. Fits factory lower fairing speaker pods with a 1/2" spacer
  • Does not fit 2013 and earlier Road Glide fairings
  • Does not fit tour pack locations
  • The speaker frame is an industry-standard 6.5" with a standard bolt pattern


Very High Level Performance

Road Glide

Street Glide

What's Included

  • (1) Helix DSP Amplifier
  • (1) Pair of Velocity 65h Coax Speakers
  • All hardware, crossovers, and manuals


Product Overview

The Brand New Helix M FOUR DSP is a powerful 4-channel amplifier with a fully-integrated digital sound processor manufactured in Germany that brings a continuous output of 135 Watts per channel, both at 4 Ohms and 2 Ohms. This game-changing control center is cool, compact, extremely practical, and up for any challenge in your Harley system.

Perfect for integration with factory Harley radios, the M Four amplifier/DSP has a number of features that make it totally different than anything else ever made.

Technical Specifications

  • Model: M FOUR DSP
  • Power RMS: @ 4 Ohms: 4 x 135 W; @ 2 Ohms: 4 x 135 W; Bridged @ 4 Ohms: 2 x 270 W
  • 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: 22 kOhms
  • Input impedance high-level: 9-33 Ohms
  • 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: 295 MHz
  • Sampling rate: 48 kHz
  • DSP Type: Audio signal processor
  • Signal converters: A/D: AKM 32 Bit, D/A: AKM 32 Bit
  • Signal-to-noise ratio digital input: 105/108 dB Speaker / Line Output
  • Signal-to-noise ratio analog input: 102/105 dB Speaker / Line Output
  • Distortion: < 0.03/0.005 % Speaker / Line Output
  • 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”


  • StageXpander makes the entire system sound bigger and bolder
  • Dynamic Bass Enhancement maximizes deep bass
  • ClarityXpander feature adds additional harmonics in the upper-frequency range
  • Built-in input RTA and input EQ that can compensate for any radio flash. No need to flash your bike for a perfect signal.
  • Built-in 10 channel EQ, crossover, phase control
  • Built-in signal meter and anti clipping feature saves speakers at insane volume levels 
  • 135 Watts RMS output power per channel
  • Extremely efficient low-heat dissipation
  • Bridgeable amplifier channels for driving powerful speakers
  • DSP-board manufactured in Germany

Velocity RZ65h

Product Overview

The Velocity RZ65H speakers are a huge jump forward in tunability for pro-audio-type speakers on Harley baggers. We built the RZ65H speakers to sound better out of the box without the typical response issues of horn-loaded pro-audio-type speakers. 

Technical Specifications

  • Sensitivity: 101db 1W/1M
  • Frequency Response: 100hz - 20khz
  • Nominal Impedance: 4 Ohms
  • RMS/Max: 300W/600W (pair)
  • Outside diameter: 6.625" 
  • Mounting Hole: 5.73"
  • Mounting Depth: 3.125"
  • Total Depth: 3.375
  • Bolt Circle: 6.22"


  • Much better sounding high frequency than other horns 
  • Better low-end punch
  • Great sounding out of the box
  • Water-resistant
  • 2 Year Warranty