HD-A2B8 – 10-Channel Amplifier Replacement Interface
(8 Analog + 2 Digital Outputs with Full DSP and Factory Subwoofer Support)
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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 6×9 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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DSP Tuning Access:
• Includes preloaded DSP tunes for:
• Hertz Audio Systems
• Velocity Audio Systems
• Extreme Audio Systems
• …and many more manufacturers coming soon!
• Easily pair with any universal amplifier for fast, optimized installation.
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Coming Soon:
• Automatic DSP tuning via upcoming software update
• Additional tuning features and enhancements under active development
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Vehicle Compatibility:
• 2024-Up Base Model Street Glide
• 2024-Up Base Model Road Glide
• 2023.5-Up CVO Street Glide
• 2023.5-Up CVO Road Glide
• 2024-Up CVO ST Models
