The Hertz HSP3-24 A2B Base Harley Stage 3 stereo system is a complete motorcycle audio upgrade designed for 2024 and newer Harley-Davidson Touring motorcycles equipped with the factory Base audio system. This plug-and-play kit combines high-efficiency SPL speakers, a powerful compact amplifier, and an advanced A2B interface module to dramatically increase volume, clarity, and overall sound performance while riding.
Factory motorcycle audio systems often struggle to overcome wind noise and engine noise at highway speeds. The HSP3-24 A2B Base system solves this problem by adding dedicated amplifier power and high-sensitivity speakers designed specifically for the open-air riding environment of Harley touring motorcycles.
By upgrading both the front fairing speakers and rear saddlebag speakers, this system creates a balanced front-to-rear sound stage capable of delivering loud, clear audio even during long highway rides.
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Key Features
• Complete Harley Stage 3 motorcycle stereo upgrade
• Designed for 2024+ Harley-Davidson Touring motorcycles with Base audio systems
• Includes four high-efficiency SPL speakers
• Compact SP 4.900 four-channel motorcycle amplifier
• Advanced A2B interface module for factory radio integration
• Plug-and-play wiring designed for Harley touring motorcycles
• Built to withstand vibration, weather exposure, and outdoor riding environments
This system allows riders to dramatically increase audio output while maintaining compatibility with the factory Harley radio system.
What’s Included in the HSP3-24 A2B Base Kit
The HSP3-24 A2B Base kit includes the major components needed to upgrade the front and rear speakers of compatible Harley touring motorcycles.
Included components:
• (2) Hertz SX165 NEO 6.5-inch SPL coaxial speakers for front fairing installation
• (2) Hertz SX690H NEO 6×9 three-way speakers for rear saddlebag installations
• Hertz SP 4.900 Class-D four-channel amplifier
• HD A2B interface module for Base audio systems
• HHP14 power and ground cable
• Replacement Harley-style speaker grille badges
• Installation hardware and documentation
These components combine to create a complete Harley audio system designed for significantly higher output than the factory speakers.
Harley Davidson Fitment
The Hertz HSP3-24 A2B Base system is designed specifically for 2024 and newer Harley-Davidson Touring motorcycles equipped with the factory Base audio system.
Compatible motorcycles may include:
• Street Glide
• Road Glide
• Road Glide Limited
• other Harley touring models equipped with Base audio architecture
The included A2B integration module allows the aftermarket amplifier and speakers to communicate with the factory Harley audio network while retaining normal radio functionality.
High-Efficiency SPL Motorcycle Speakers
The HSP3-24 system uses Hertz SPL Show series speakers, engineered specifically for motorcycle audio systems that require high output and strong projection.
Front Speakers – SX165 NEO
The front speakers installed in the Harley fairing feature:
• high-efficiency SPL design
• neodymium magnet motor structures
• treated paper cones with water-resistant coating
• excellent sensitivity for strong sound projection
These speakers are designed to produce clear vocals and strong midrange response that remains audible during highway riding.
Rear Speakers – SX690H NEO
The rear speakers are 6×9 three-way coaxial speakers designed for Harley saddlebag speaker systems.
Key features include:
• high-output SPL design
• 1.4-inch dome tweeter and 1-inch super tweeter
• weather-resistant materials
• extended frequency response designed for motorcycle audio systems
Together, the front and rear speakers create a powerful full-range sound stage while riding.
SP 4.900 High-Output Motorcycle Amplifier
At the center of the system is the Hertz SP 4.900 four-channel amplifier, designed specifically for powersports audio applications.
Amplifier highlights include:
• 160 watts RMS × 4 channels at 4 ohms
• 250 watts RMS × 4 channels at 2 ohms
• up to 1000 watts total system power
• compact chassis designed for motorcycle installation
• efficient Class-D amplifier design for reliability
The amplifier provides the power necessary to drive the high-efficiency SPL speakers and produce clean, distortion-free audio.
A2B Integration Module
Modern Harley touring motorcycles use A2B digital audio networking, which requires specialized integration when upgrading the audio system.
The HD A2B interface module included in this system allows the amplifier to integrate with the factory Harley radio while providing dedicated outputs for upgraded speakers.
This integration allows riders to keep the factory radio controls while dramatically improving audio performance.
Designed for Harley Bagger Audio Systems
The HSP3-24 A2B Base system represents a Stage 3 Harley audio upgrade, providing amplified front speakers and powerful rear speakers for a balanced motorcycle audio system.
Compared to factory Harley speakers, this upgrade delivers:
• louder overall volume while riding
• improved vocal clarity
• stronger midbass response
• better sound projection at highway speeds
For riders who spend long hours on the road, upgrading to a Stage 3 Harley stereo system can dramatically improve the riding experience.
Specifications
Amplifier: SP 4.900 Class-D
Amplifier Power: 160W × 4 @ 4Ω / 250W × 4 @ 2Ω
Front Speakers: SX165 NEO 6.5-inch coaxial speakers
Rear Speakers: SX690H NEO 6×9 three-way speakers
Speaker Sensitivity: high-efficiency SPL design
Integration: HD A2B interface module
Power Cable: HHP14 power and ground cable
Frequently Asked Questions
Will the Hertz HSP3-24 A2B Base kit work on my 2024 Harley-Davidson touring motorcycle?
The HSP3-24 A2B Base system is designed for 2024 and newer Harley-Davidson Touring motorcycles equipped with the factory Base audio system. Compatible models may include Street Glide, Road Glide, and other touring models using Harley’s A2B digital audio architecture.
What does A2B audio mean on Harley motorcycles?
A2B is a digital audio network used on modern Harley touring motorcycles to connect the radio, amplifier, and speakers. Because this system uses digital communication, upgrading the audio requires specialized integration modules. The Hertz HSP3-24 A2B Base kit includes an A2B interface module that allows the aftermarket amplifier and speakers to integrate properly with the factory radio.
Do I need an amplifier for motorcycle speakers?
Yes. Motorcycle audio systems benefit significantly from dedicated amplifier power. The HSP3-24 A2B Base system includes the Hertz SP 4.900 four-channel amplifier, which provides the power necessary to drive the high-efficiency speakers and produce louder, clearer sound while riding at highway speeds.
Does this system upgrade both front and rear speakers?
Yes. The HSP3-24 A2B Base kit upgrades both the front fairing speakers and rear saddlebag speakers. The system includes 6.5-inch front speakers and high-output 6×9 rear speakers to create a balanced motorcycle audio system.
Is this considered a Stage 3 Harley audio upgrade?
Yes. The HSP3-24 A2B Base system is designed as a Stage 3 Harley stereo upgrade, combining amplified front speakers and powerful rear speakers to produce significantly louder sound compared to factory motorcycle audio systems.
Can this system be professionally installed?
Yes. Stereo Installs offers professional Harley stereo installation and motorcycle audio upgrades at our shop in Mentor, Ohio. Our technicians specialize in Harley touring audio systems, amplifier installation, and complete bagger stereo builds.
Does this upgrade improve sound while riding at highway speeds?
Yes. The combination of high-efficiency SPL speakers and amplifier power allows the system to overcome wind noise and road noise, making music easier to hear while riding at highway speeds.
Professional Harley Audio Installation
Stereo Installs specializes in Harley-Davidson stereo upgrades and motorcycle audio installation.
Our shop installs motorcycle audio systems for riders throughout Northeast Ohio including:
Mentor, Willoughby, Eastlake, Painesville, Cleveland
Stereo Installs
7471 Tyler Blvd STE B
Mentor Ohio 44060
(440) 525-2001
Services include:
• Harley stereo installation
• motorcycle amplifier installation
• saddlebag speaker upgrades
• custom bagger audio systems
Professional installation ensures proper wiring, tuning, and long-term reliability.
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We want you to be 100% satisfied with your purchase. Items can be returned or exchanged within 30 days of delivery.