Hertz A2B Stage 4 Ultimate Plug & Play Amp And Speaker Package with Subwoofer Kit For 2025 Harley Davidson® Street Glide Ultra Motorcycles Adds Tour Pak Pods

Tired of struggling to hear your factory Harley speakers at highway speeds? Or constantly replacing blown speakers? You’re not alone!

At Volunteer Audio, we understand these common frustrations, and we’ve created a solution that will revolutionize your riding experience. Our Stage 4 amplifier and speaker system ensures your music sounds incredible, even at 100 mph.

Why Choose the Volunteer Audio Stage 4 System?

• Exceptional Sound Clarity: Our package delivers powerful, clear audio, allowing you to enjoy your favorite tunes without distortion, no matter how fast you’re going.
• Easy Upgrade: Keep your factory radio while enhancing your sound system. Our prewired amplifier is set up for optimal performance with your factory Skyline OS Infotainment radio.
• Durability: The IP64 rated compact amplifier is moisture-resistant, and the Hertz speakers feature weather-resistant cones, making them perfect for any riding conditions.

What’s Included in the Stage 4 Package?

• Prewired Amplifier: Gains and filters adjusted specifically for your factory Skyline OS Infotainment radio.
• 1 Pair of Hertz SX165NEO 6.5” Upper Fairing Speakers: High-quality replacements for your factory speakers.
• 1 Pair of Hertz SV165NEO 6.5” Tour Pak Speakers: Designed for clear sound and durability.
• Hertz Power/Ground Harness: Ensures reliable power and grounding for optimal performance and longevity.
• Volunteer Audio HD-A2B Interface: Seamlessly integrates with your Harley Davidson, expertly tuned for Hertz systems. 
• BC-SPG Tour Pak Grilles: Stylish and functional grilles to protect your new speakers and complete your audio upgrade with a sleek look.

Why Volunteer Audio?

• Pre-Configured Convenience: We do all the hard work for you. Your kit arrives with gains and filters already set, making installation straightforward.
• Step-by-Step Support: Our detailed videos guide you through the installation process, and our lifetime tech support is always here to help.
• Lifetime Tech Support: We offer lifetime support for any items purchased from us, ensuring you have assistance whenever needed.

Hertz / Cicada Audio Subwoofer Kit

Introducing the Hertz / Cicada Audio Add-On Subwoofer Kit—your new add-on bass solution built for our plug-and-play Hertz SP4.900 2-speaker and 4-speaker kits.

This ported and braced dual-10" subwoofer kit transforms your saddlebags into true bass enclosures using the included cut-in template. The 10" subs mount directly into the bag itself, delivering the deep, low-frequency punch your 6×9 speakers can’t reach.

Kit includes disconnect harness to still allow for easy removal of saddlebag.

What's Included:

• (2) Hertz CS 250 S2 10" Subwoofers – Powerful 2-ohm subs delivering deep, controlled bass with 250W RMS per speaker.
• Cicada Audio 24HDRING10 – Left & Right precision mounting rings for perfect saddlebag integration.
• Cicada Audio 24HDRINGT – Left & Right trim rings for a complete, sealed fit.
• Cicada Audio 24HDPORT3 – Pair of Flush-mount, ABS-molded ports for optimized airflow and stronger low-end output.
• Plug-and-Play Wiring – easily ties into the Hertz SP4.900 amp.
• Hardware Pack – All stainless hardware needed for a clean, secure install which includes: (16) 8-32 x 1.25 inch screws, (16) #8 Washers, (16) 8-32 Lock Nuts

HD-A2B 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.

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:

• Specifically tuned for Hertz SP4.900 amplifier and Hertz Neo Motorcycle speakers.
• Equalization:
  • 31-band equalizer for each independent channel.
  • 7-band parametric global EQ aligning with infotainment custom EQ settings.

Technical Specs:

• RCA Outputs: 5 Channel, 4v RMS (Front, Rear, and Subwoofer connections)
• Frequency Response: 20 Hz – 24 kHz
• Signal to Noise Ratio: 112 dB
• DSP Resolution: 32-bit
• Operational Voltage: 6-28 volts
• Current Consumption:
  • Idle: 14 microamps
  • Full Power: 300 milliamps

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

Ready to Elevate Your Ride?

At Volunteer Audio, we’re committed to providing you with an amazing sound system for your Harley Davidson. Our Stage 2 package is designed for top-notch performance and durability, transforming your motorcycle into a high-quality audio experience. Ready for a sound transformation? Let us help you get there!