Velocity | SKU: HDPKG1984

Velocity Stage 4 Ultimate A2B Plug & Play Amp And Speaker Package with Modular Subwoofer Kit For 2024-Up Harley Davidson® Base Model Street Glide Motorcycle

Name: Velocity Stage 4 Ultimate A2B Plug & Play Amp And Speaker Package with Modular Subwoofer Kit For 2024-Up Harley Davidson® Base Model Street Glide Motorcycle
Brand: Velocity
SKU: HDPKG1984
Availability: InStock

$0⁰⁰ USD

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Can you hear your factory Harley speakers at highway speeds?

We didn't think so.

Trying to crank your factory radio all the way up just to hear your music? Chances are you've already noticed the lack of volume, poor clarity, or maybe you've even blown a factory speaker trying.

That's exactly why Volunteer Audio developed the Velocity Razor Stage 4 Performance Package.

Featuring the Velocity Razor Pro amplifier, Velocity Razor Coax Neo speakers, and the American Hard Bag Modular Bass System, this system is engineered to deliver incredible output, crystal-clear vocals, powerful midbass, and deep, musical bass that stays clean even at interstate speeds.

Whether you're cruising back roads or riding 80+ MPH on the highway, your music stays loud, detailed, and enjoyable.

What Makes This System Exceptional?

High-Efficiency Class D Amplifier: The Velocity Razor Pro amplifier is purpose-built for motorcycle audio, delivering exceptional output from a compact chassis. Its efficient Class D design provides clean, reliable power while producing less heat and placing less demand on your motorcycle's charging system.

Premium Neodymium Speakers: The Velocity Razor Coax Neo speaker system combines the RCN65 6.5" upper fairing speakers with the RCN69 6x9" saddlebag speakers to create exceptional vocal clarity, detailed highs, powerful midbass, and a rich, balanced soundstage throughout your motorcycle.

American Hard Bag Modular Subwoofer System: Designed specifically for Harley-Davidson® touring motorcycles, the Modular Bass System adds deep, musical low frequencies without sacrificing valuable saddlebag storage. Engineered as a complete acoustic system, it delivers clean, powerful bass that perfectly complements the Velocity Razor speakers.

Built for Harley-Davidson®: Every component is selected with Harley-Davidson touring motorcycles in mind, creating a system that offers exceptional performance, reliability, and easy installation.

Package Includes:

Pre-Wired Amplifier: Available with 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 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 2024+ Harley-Davidson® factory non-speaker saddlebag lids. Includes templates, black grilles, and mounting hardware.
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.

Why Choose Volunteer Audio?

Pre-Configured Kit: We complete all the prep work before your system ships, setting amplifier gains and crossover filters so your kit arrives as close to plug-and-play as possible.

Easy Installation: Includes mounting hardware and step-by-step installation videos. Simply mount the amplifier, connect the wiring, install the speakers and subwoofer, and enjoy premium sound.

Lifetime Tech Support: Every Volunteer Audio package includes lifetime technical support from our experienced motorcycle audio specialists.

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

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

Ready to Elevate Your Ride?

At Volunteer Audio, we've combined the latest Velocity Razor technology with our proven plug-and-play integration and the American Hard Bag Modular Bass System to create a motorcycle audio package that delivers incredible volume, exceptional clarity, powerful midbass, and deep, musical bass mile after mile.

If you're ready to finally hear your music the way it was meant to be heard, the Velocity Razor Stage 4 Performance Package is ready for your next ride.