Velocity Premium A2B Stage 4 Plug & Play Amp And Speaker Package For 2026 Harley Davidson® CVO Street Glide ST Motorcycles

For CVO Street Glide ST Motorcycles

Can you hear your factory Harley speakers loud and clear at highway speeds?

We didn’t think so.

Tired of blowing those factory speakers just trying to hear them?

Of course you are! These are common issues we hear at Volunteer Audio, and we’re here to offer a solution that will blow you away.

Our Volunteer Audio Velocity Razor Stage 4 amplifier and speaker system is designed to transform your audio experience. This package allows you to keep your factory radio while upgrading your sound system. To get the full potential from your new amplifier and speakers, a flash is required to optimize performance.

With this setup, you’ll enjoy music that’s loud, clean, and clear even at highway speeds!

What Makes This System Exceptional?

• High-Output Performance: The Velocity Razor system is designed specifically for demanding motorcycle audio applications, providing the output and clarity needed to overcome wind, exhaust, and road noise.
• Premium Neodymium Speakers: Velocity Razor Coax Neo speakers feature lightweight neodymium motors and integrated tweeters that deliver crystal-clear vocals, detailed highs, and powerful midbass.
• Complete Front & Rear Sound: With RCN65 speakers in the upper fairing and RCN69 6x9” speakers in the saddlebag lids, the Stage 4 system delivers powerful front sound with enhanced rear output and midbass for a fuller listening experience.
• Compact, Efficient Amplification: The Velocity Razor Pro amplifier delivers the clean power needed to drive your speakers while maintaining a compact footprint ideal for motorcycle installations.

Package Includes:

• Pre-Wired Velocity Razor Pro RZP1500.4 or RZP2000.6 Amplifier: Gains and filters are professionally adjusted for your factory Skyline OS Infotainment radio.
• Volunteer Audio HD-A2B8 Interface: Seamlessly integrates with your Harley-Davidson®, expertly tuned for Velocity Razor systems.
• 1 Pair of Velocity Razor Coax Neo RCN65 6.5” Upper Fairing Speakers: High-output neodymium coaxial speakers designed to deliver crystal-clear vocals, detailed highs, strong midbass, and impressive output at highway speeds.
• 1 Pair of Velocity Razor Coax Neo RCN69 6x9” Saddlebag Lid Speakers: Premium high-output neodymium coaxial speakers engineered to provide exceptional midbass, outstanding clarity, and the output needed to keep your music loud and clean on every ride.
• 1 Pair of Volunteer Audio IP-24-LIDKIT-V 6x9” Saddlebag Speaker Cut Kits: Precision-engineered cut kits for installing the Velocity Razor Coax Neo RCN69 speakers into factory non-speaker saddlebag lids. Includes templates, black grilles, and mounting hardware.
• Velocity Razor Power/Ground Harness: Provides clean, reliable power and grounding for optimal amplifier performance.

Why Choose Volunteer Audio?

• Pre-Configured Kit: We complete all the prep work, setting gains and filters so you don’t have to. The kit arrives as close to finished as possible, making installation straightforward.
• Easy Installation: Includes mounting hardware and clear step-by-step videos. You only need to mount the amplifier, connect the wiring under the seat and to the battery, install the speakers, and complete the saddlebag lid installation.
• Lifetime Tech Support: We offer lifetime support for any items purchased from us, ensuring you get the help you need.

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HD-A2B8 Amplifier Replacement Interface

Compatibility:

• Designed for Harley-Davidson models equipped with the Skyline OS Infotainment Unit.

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Purpose:

• Allows for the removal of the stock amplifier.

• Facilitates the installation of higher power aftermarket amplifiers.

• Maintains compatibility with factory-installed Rockford Fosgate subwoofers and rear-mounted secondary amplifiers.

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Manufacturer:

• Designed and manufactured by SeirenHD exclusively for Volunteer Audio.

• Engineered and manufactured in the USA.

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Pre-Tuned for Plug-and-Play Performance

The HD-A2B8 interface from Volunteer Audio and SeirenHD is ready to install right out of the box—no tuning required for standard systems.

Already optimized for immediate use:

• Flat EQ Curve – Delivers a clean, uncolored audio signal

• Pre-Set Output Levels – Optimized to run clean at full volume with zero clipping

• Speed-Controlled Volume – Fully retained and pre-configured to match factory behavior

• Fader Support – Works immediately without any setup

• All Factory Features Intact – Including navigation prompts, radio EQ selections, and more

Tuning is optional, only necessary when:

• Activating crossovers

• Using the 31-band or 10-band EQ to customize for specific speaker setups

• Adjusting time alignment or per-channel output levels

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Plug-and-Play Harnessing

The HD-A2B8 includes a harness that connects directly to all factory speaker wiring with zero modification to your motorcycle.

For expanded setups, additional plug-and-play harnessing is available below:

• Underseat Harness – Pins into the factory plug on base model bikes

• Lid Disconnect Harness – Clean, quick-disconnect solution for 6x9 lid speaker installations

• Tour Pack Harness – Adds plug-and-play rear audio for Tour Pack installations

• Lower Fairing Harness – Simple solution for adding speaker pods to your lower fairings

All harnessing options are pre-configured and labeled for quick installation and available for purchase below.

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Integration Features:

• Utilizes the OE A2B chip for seamless factory integration

• Supports all factory infotainment updates

• Retains full factory functionality, including:

 • Fader

 • EQ selections with DSP profile adjustments

 • Speed-controlled volume

 • Navigation prompts

 • Digital A2B subwoofer output for HD Audio by Rockford systems

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DSP Specifications:

• 10 Output Channels with Full DSP Control:

 • 8 Analog RCA Outputs

 • 2 Digital A2B Outputs for Rockford subwoofers

• Equalization:

 • Per-channel 31-band graphic EQ or 10-band parametric EQ

 • Global 7-band parametric EQ mirrors infotainment custom EQ settings

• Time Alignment:

 • Independent delay settings for every channel

• Crossover Control:

 • Independent high-pass and low-pass filters per output pair

• Level Adjustment:

 • Individual channel-level control for precise tuning

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Technical Specifications:

• RCA Outputs:

 • 8 Channels, 4v RMS

 • Front, Rear, Subwoofer, and Auxiliary output configuration

• Frequency Response: 20 Hz – 24 kHz

• Signal-to-Noise Ratio: 112 dB

• DSP Resolution: 32-bit

• Operating Voltage: 6–28 volts

• Current Draw:

 • Idle: 14 µA

 • Full Power: 300 mA

• Warranty: 1 Year

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Velocity Razor Pro Amplifier

The Velocity Razor Pro amplifier is designed for high-performance motorcycle audio systems where space is limited but clean power and serious output are essential.

Its compact, high-efficiency Class D design provides the power needed to properly drive the Velocity Razor Coax Neo speakers while helping reduce unnecessary heat and electrical demand on the motorcycle’s charging system.

Paired with the Velocity Razor Coax Neo RCN65 upper fairing speakers and RCN69 6x9” saddlebag speakers, the Razor Pro amplifier provides the power and control needed to maintain crystal-clear vocals, detailed highs, powerful midbass, and impressive output at highway speeds.

The combination of RCN65 speakers up front and the larger RCN69 speakers in the saddlebag lids creates a balanced system with excellent front-stage clarity and additional rear output and midbass.

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Ready to Elevate Your Ride?

At Volunteer Audio, we’ve paired the Velocity Razor Pro amplifier with Velocity Razor Coax Neo RCN65 and RCN69 speakers to create a Stage 4 system designed to take your CVO Street Glide ST beyond the limitations of its factory audio system.

With RCN65 speakers delivering clean, powerful sound from the upper fairing and RCN69 6x9” speakers adding additional output and midbass from the saddlebag lids, you’ll experience a fuller, more powerful sound that stays clear even at highway speeds.

Ready for a sound transformation? Let Volunteer Audio help you hear your Harley the way it was meant to sound.