Velocity Stage 6 Ultimate A2B Plug & Play Amp And Speaker Package with Modular Subwoofer Kit For 2025 Harley Davidson® CVO Street Glide 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 ALL the time at Volunteer Audio. That's why we're here to deliver a sound experience that will truly blow you away.

Can you really hear rear speakers when added to your bike?

Absolutely!

We get this question frequently, and the answer is a resounding YES. Here's how we ensure you get the full benefit from your rear speakers:

Proper Power: The Velocity Razor Pro RZP2000.6 amplifier provides the clean power needed to drive your system, ensuring your speakers can be heard clearly even at highway speeds.

Balanced Sound: While your fairing speakers naturally remain the primary sound source, the rear speakers in both the saddlebag lids and Tour Pak create a fuller, more immersive surround sound experience with enhanced midbass and exceptional clarity.

Added Low-End Performance: The drop-in subwoofers take the system one step further by adding the low-frequency impact your factory system is missing. They integrate into the factory subwoofer locations for a clean installation while giving your music greater depth, punch, and a much fuller overall sound.

Our Comprehensive Velocity Razor Audio Upgrade Package Includes:

• Pre-Wired Amplifier: Includes the Velocity Razor Pro 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, and powerful midbass at highway speeds.
• 1 Pair of Velocity Razor Coax Neo RCN69 6x9" Saddlebag 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 Velocity Razor Coax Neo RCN65 6.5" Tour Pack Speakers: Matching high-output neodymium coaxial speakers that provide seamless tonal balance and outstanding rear fill, creating a richer listening experience for both rider and passenger.
• American Hard Bag IP24SWEV Modular Subwoofer Kit: Complete plug-and-play modular bass system featuring the Velocity Performance Edition 10-inch subwoofer, engineered specifically for the American Hard Bag enclosure to deliver tight, musical bass with outstanding impact and low-frequency performance.
• Velocity Razor Power & Ground Harness: Provides clean, reliable power delivery for maximum amplifier performance.
• Rear Backbone Harness and T-Harness: Designed for an optimal fit and true plug-and-play installation.

Why Choose Volunteer Audio?

Pre-Configured Kit: We handle all the prep work, including setting amplifier 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. Simply mount the amplifier, connect the wiring under the seat and to the battery, and install the speakers and subwoofers.

Lifetime Tech Support: We offer lifetime support on everything purchased from Volunteer Audio, ensuring expert assistance whenever you need it.

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American Hard Bag Modular Bass System

The American Hard Bag Modular Bass System is available with your choice of two premium 10-inch subwoofers.

Both have been extensively tested in this enclosure and both deliver exceptional performance. Neither is better. They simply have different personalities.

Velocity Performance Edition

Engineered Specifically for the American Hard Bag Enclosure

The Velocity 10-inch subwoofer wasn’t selected from an existing catalog.

It was engineered specifically for the American Hard Bag enclosure, creating a system where the driver, enclosure, and passive radiator were developed together as a complete acoustic package.

Rated at 300 Watts RMS and 600 Watts Maximum Power, the Velocity subwoofer features an injection-molded cone, Santoprene surround, oversized 56-ounce ferrite motor, and a 38 mm TIL voice coil to deliver exceptional punch, musicality, and long-term reliability.

If your playlist is filled with country, rock, blues, classic rock, or live recordings, the Velocity Performance Edition delivers outstanding impact and natural musical accuracy.

Ideal For: Country, Rock, Classic Rock, Southern Rock, Blues, and Live Recordings

Performance Highlights:

• 300 Watts RMS
• 600 Watts Maximum Power
• Frequency Response: 20-400 Hz
• Injection-Molded Cone
• Santoprene Surround
• 38 mm TIL Voice Coil
• 56 oz Ferrite Magnet

Expect:

• Tight, punchy bass
• Incredible kick drum impact
• Excellent bass guitar definition
• Fast transient response
• Natural, musical low frequencies

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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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Ready to Elevate Your Ride?

At Volunteer Audio, we've paired the latest Velocity Razor Pro amplifier, Velocity Razor Coax Neo speakers, and drop-in subwoofers to create our most complete CVO audio upgrade. With premium sound from the upper fairing, saddlebag lids, and Tour Pak plus added low-frequency impact from the subwoofers, you'll experience incredible volume, exceptional clarity, powerful bass, and immersive front-to-rear sound while maintaining a clean, factory-style installation.

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