This will be specifically tuned for the HD Audio by Rockford Stage 3 system.

What Makes This System Exceptional?

Weather-Resistant Components: The amplifier is compact and IP64 rated, ensuring durability in all weather conditions.

Package Includes:

Pre-Wired Amplifier: Gains and filters are adjusted perfectly for your factory Skyline OS Infotainment radio tuned for the Stage 3 HD by Rockford system.
Volunteer Audio HD-A2B8 Interface: Seamlessly integrates with your Harley Davidson.

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 to under the seat and battery.
Lifetime Tech Support: We offer lifetime support for any items purchased from us, ensuring you get the help you need.

HD-A2B8 Amplifier Replacement Interface

Compatibility:

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

Purpose:

Allows the removal of the stock amplifier.
Facilitates the installation of a higher power amplifier.
Maintains compatibility with factory-installed Rockford Fosgate subwoofers and rear-mounted secondary amplifiers.

Manufacturer:

Designed and manufactured by SeirenHD exclusively for Volunteer Audio.
Engineered and manufactured in the USA.

Integration Features:

Utilizes the same OE A2B chip for seamless integration.
Supports factory infotainment updates.
Retains factory features including:
- Fader
- EQ selections with DSP profile adjustments
- Speed-controlled volume
- Navigation prompts

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

Technical Specs:

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

Hertz SP4.900 Amplifier

Our friends at Hertz have released a game changer for motorcycle audio! The Hertz SP4.900 amplifier offers a small footprint but huge output. It’s the most powerful amp available in its size, delivering 160W RMS @ 4Ω and 250W RMS @ 2Ω. With a remarkably low distortion rate of 0.02% THD, it’s the perfect choice for your motorcycle audio system.

Technical Specs:

Output Nominal Power (RMS) @ 14.4 VDC, THD 1%:
- 4 Ch:
  - 160 W x 4 (4Ω)
  - 250 W x 4 (2Ω)
- 3 Ch:
  - 160 W x 2 (4Ω) + 500 W x 1 (4Ω)
  - 250 W x 2 (2Ω) + 500 W x 1 (4Ω)
- 2 Ch:
  - 500 W x 2 (4Ω)
- Total Power RMS: 1000 W
Dyno Specs:
- Box rating: 160 watts at 4Ω, Dyno reads 173 watts at 4Ω
- Box rating: 250 watts at 2Ω, Dyno reads 288 watts at 2Ω

Extreme Audio Road Glide Amp and A2B Plates:

Extreme Audio amp plates are precision-stamped from durable steel, then powder-coated in Wisconsin, USA, for long-lasting protection. Designed for a perfect fit with SP4.900 or SP4.500 amplifiers, these 100% bolt-in mounts require no bike modifications and include all hardware to securely attach both the amplifier and SeirenHD A2B module-- no velcro or extra parts needed.

Extreme Audio amp plates are precision-stamped from durable steel, then powder-coated in Wisconsin, USA, for long-lasting protection. Designed for a perfect fit for the SeirenHD A2B module, these 100% bolt-in mounts require no bike modifications and include all hardware to securely attach the module-- no velcro or extra parts needed.

Hertz Amplifiers

Hertz Premium SP4.900-A2B8 Plug & Play Amp Tuned for HD Audio by Rockford Stage 3 System with Amp and A2B Mount on Harley Davidson® 2024-Up Base Model Road Glide and 2023.5-Up CVO Road Glide Motorcycles ( SP4 900 )