Volunteer Audio HD-A2B8 10-Channel A2B Amplifier Replacement Interface for 2023.5+ Harley
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Volunteer Audio HD-A2B8 10-Channel A2B Amplifier Replacement Interface for 2023.5+ Harley
$799.99
$799.99
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Volunteer Audio HD-A2B8 10-Channel A2B Amplifier Replacement Interface for 2023.5+ Harley
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Volunteer Audio HD-A2B8 10-Channel A2B Amplifier Replacement Interface for 2023.5+ Harley
The Volunteer Audio HD-A2B8 is a 10-channel amplifier replacement interface designed for Harley-Davidson motorcycles equipped with the Skyline OS infotainment system. It allows the factory amplifier to be removed while providing clean, high-level system integration for aftermarket amplifiers without sacrificing key factory functions.
The HD-A2B8 provides eight 4V RMS analog RCA outputs plus two digital A2B outputs for compatible factory Rockford Fosgate subwoofer systems, giving installers a flexible platform for high-output aftermarket audio builds while retaining factory controls and vehicle integration.
10 Outputs. Full DSP. Factory A2B Integration.
Remove the stock amplifier, add aftermarket power, retain factory functionality, and control the complete system from one A2B interface.
Volunteer Audio HD-A2B8 Key Specifications
| Model | HD-A2B8 |
| Product Type | 10-Channel A2B Amplifier Replacement Interface with DSP |
| Vehicle Platform | Harley-Davidson motorcycles equipped with Skyline OS |
| Total DSP Outputs | 10 channels |
| Analog Outputs | 8 RCA channels |
| Analog Output Voltage | 4V RMS |
| Digital Outputs | 2 A2B channels for compatible factory Rockford subwoofers |
| DSP Resolution | 32-bit |
| Equalization | 31-band graphic EQ or 10-band parametric EQ per channel |
| Global EQ | 7-band parametric EQ |
| Time Alignment | Independent delay control for every channel |
| Crossover Control | Independent high-pass and low-pass filters by output pair |
| Channel Level Control | Independent per-channel level adjustment |
| Frequency Response | 20 Hz – 24 kHz |
| Signal-to-Noise Ratio | 112 dB |
| Operating Voltage | 6V – 28V |
| Idle Current Draw | 14 µA |
| Full-Power Current Draw | 300 mA |
| Warranty | 1 Year |
| Manufacturing | Designed and manufactured in the USA by SeirenHD exclusively for Volunteer Audio |
Replace the Factory Amplifier Without Losing Factory Integration
The HD-A2B8 is designed for Harley audio systems where the goal is to remove the factory amplifier and replace it with higher-power aftermarket amplification.
Instead of bypassing or sacrificing factory functionality, the interface works with the motorcycle's A2B network to preserve key infotainment and audio features while providing clean outputs for the aftermarket system.
- Allows removal of the factory amplifier.
- Supports installation of higher-power aftermarket amplifiers.
- Maintains compatibility with supported factory Rockford Fosgate subwoofers.
- Maintains compatibility with supported rear-mounted secondary amplifiers.
10 DSP-Controlled Outputs
The HD-A2B8 provides a total of 10 DSP-controlled output channels, giving installers substantially more flexibility than a basic A2B-to-RCA interface.
8 Analog RCA Outputs
Eight 4V RMS RCA outputs can be configured for front, rear, subwoofer, and auxiliary amplifier channels.
2 Digital A2B Outputs
Two digital outputs retain compatibility with supported factory Rockford Fosgate subwoofer systems.
Pre-Tuned for Plug-and-Play Performance
Volunteer Audio and SeirenHD ship the HD-A2B8 preconfigured for standard installations, so a basic system does not require DSP tuning before it can be used.
- Flat EQ curve for a clean, uncolored signal.
- Pre-set output levels optimized for clean full-volume operation.
- Speed-controlled volume retained and preconfigured.
- Factory fader operation retained without additional setup.
- Navigation prompts and factory radio EQ selections retained.
Full DSP Control When You Need It
For advanced systems, the HD-A2B8 includes full digital signal processing rather than functioning only as a signal converter.
Per-Channel EQ
Choose between a 31-band graphic EQ or 10-band parametric EQ for individual output channels.
Time Alignment
Independent channel delay allows precise timing adjustment across the complete speaker system.
Crossovers
Independent high-pass and low-pass filtering is available for each output pair.
Level Control
Individual channel-level adjustment allows precise front, rear, subwoofer, and auxiliary balancing.
Factory Features Retained
Because the HD-A2B8 integrates directly with the Harley A2B network, it retains core factory infotainment functions instead of forcing the system into a basic aftermarket-only configuration.
- Factory fader control.
- Factory EQ selections with corresponding DSP profile adjustments.
- Speed-controlled volume.
- Navigation prompts.
- Factory infotainment updates.
- Digital A2B subwoofer output for supported Harley-Davidson Audio powered by Rockford Fosgate systems.
Plug-and-Play Factory Speaker Harnessing
The HD-A2B8 includes a harness that connects directly to the factory speaker wiring without requiring modification to the motorcycle's original wiring.
Additional plug-and-play harnessing is available separately for more complex systems.
- Underseat harness for supported base-model motorcycles.
- Lid disconnect harness for 6x9 saddlebag speaker installations.
- Tour-pack harness for rear speaker expansion.
- Lower-fairing harness for added lower speaker pods.
2023.5+ / 2024+ Harley-Davidson Fitment
The HD-A2B8 is designed for Harley-Davidson motorcycles equipped with the Skyline OS infotainment platform.
- 2024+ Harley-Davidson Street Glide base models.
- 2024+ Harley-Davidson Road Glide base models.
- 2023.5+ Harley-Davidson CVO Street Glide.
- 2023.5+ Harley-Davidson CVO Road Glide.
- 2024+ Harley-Davidson CVO ST models.
DSP Tuning Access
Advanced HD-A2B8 DSP settings can be accessed through SeirenHD's tuning platform.
Volunteer Audio also lists preloaded DSP tunes for selected audio-system brands, with additional profiles and automated tuning features planned through future software updates.
Need Help Planning Your 2023.5+ Harley Audio System?
The HD-A2B8 can support simple amplifier replacement or a much more advanced multi-amplifier DSP system. The correct installation depends on the motorcycle's factory equipment, amplifier count, speaker configuration, factory subwoofer use, and complete system design.