Hertz HSP3-24 A2B S3 Harley Stage 3 Stereo System | 2024+ Touring  

The Hertz HSP3-24 A2B S3 Harley Stage 3 stereo system is a high-performance plug-and-play motorcycle audio upgrade designed for 2024 and newer Harley-Davidson Touring motorcycles equipped with the factory Stage 3 audio package. This complete system combines powerful SPL-series speakers, a compact high-output amplifier, and an advanced A2B integration module to dramatically increase sound clarity and output while riding.

Motorcycle audio systems must overcome wind noise, engine noise, and open-air riding conditions. The HSP3-24 A2B S3 kit addresses these challenges by combining high-efficiency front speakers, powerful 6×9 rear speakers, and a dedicated amplifier engineered specifically for motorcycle environments.
The result is a balanced Harley touring audio system capable of delivering clear vocals, strong midrange output, and powerful sound projection even at highway speeds.

Explore more Harley audio upgrades

Key Features

• Complete Harley Stage 3 stereo upgrade system
• Designed for 2024+ Harley-Davidson Touring motorcycles
• Includes four high-efficiency SPL speakers
• Compact Hertz SP 4.900 four-channel amplifier
• Advanced HD A2B integration interface module
• Plug-and-play installation with motorcycle-specific wiring
• Designed to withstand vibration, weather exposure, and outdoor riding environments

This system allows riders to dramatically increase the volume and clarity of their motorcycle audio system while maintaining factory integration.

What’s Included in the HSP3-24 A2B S3 Kit

The Hertz HSP3-24 A2B S3 kit includes the major components required to upgrade both the front and rear speakers on Harley touring motorcycles.

Included components:

• (2) Hertz SX165 NEO 6.5" SPL coaxial speakers for the front fairing
• (2) Hertz SX690H NEO 6×9 three-way speakers for rear saddlebag installations
• Hertz SP 4.900 four-channel amplifier
• HD A2B interface module for factory audio integration
• HHP14 power and ground cable
• Replacement Hog badges for front and rear speaker grilles
• Installation hardware and documentation

Together these components create a complete Harley audio system capable of delivering significantly higher output than factory speakers.

Harley Davidson Fitment

The Hertz HSP3-24 A2B S3 stereo system is designed specifically for 2024 and newer Harley-Davidson Touring motorcycles equipped with the factory Stage 3 audio platform.

Compatible motorcycles may include:

• Street Glide
• Road Glide
• Road Glide Limited
• CVO touring models with A2B audio architecture

The included A2B interface module allows the system to integrate with the factory Harley audio network while adding amplifier power and upgraded speakers.

High-Efficiency SPL Motorcycle Speakers

The HSP3-24 system uses Hertz SPL Show series speakers, designed for motorcycle audio environments where efficiency and durability are critical.

Front Speakers – SX165 NEO

These 6.5-inch SPL coaxial speakers feature:

• high-efficiency design for louder output
• water-repellent treated paper cones
• neodymium magnet motor structures
• 97 dB sensitivity for strong sound projection

Rear Speakers – SX690H NEO

The rear speakers are 6×9 three-way coaxial speakers designed for saddlebag installations.

Key features include:

• 260 watts peak power handling
• 130 watts RMS power handling
• 1.4" dome tweeter and 1" super tweeter
• weather-resistant cone materials
• extended frequency response from 65 Hz to 24 kHz

These speakers deliver strong midbass and crisp high frequencies that remain audible even during high-speed riding.

SP 4.900 High-Output Motorcycle Amplifier

At the center of the system is the Hertz SP 4.900 Class-D amplifier, designed specifically for motorcycle installations.

Amplifier highlights:

• 160 watts RMS × 4 channels at 4 ohms
• 250 watts RMS × 4 channels at 2 ohms
• 1000 watts total system power
• IP55-rated aluminum chassis for weather resistance
• compact design for motorcycle mounting locations

This amplifier provides the power needed to drive the high-efficiency SPL speakers while maintaining clean, distortion-free audio.

A2B Integration Module

Modern Harley touring motorcycles use A2B digital audio architecture, which requires specialized interfaces for aftermarket upgrades.

The included HD A2B module allows the HSP3-24 system to integrate with the factory audio network while adding amplifier outputs and upgraded speaker channels. This integration maintains factory radio functionality while dramatically improving overall audio performance.

Designed for Harley Bagger Audio Systems

The HSP3-24 A2B S3 system is designed as a Stage 3 Harley audio upgrade, providing amplified front speakers and powerful rear speakers to create a balanced motorcycle sound 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 audio system dramatically improves the listening experience.

Specifications

Amplifier: Hertz SP 4.900 Class-D
Amplifier Power: 160W × 4 @ 4Ω / 250W × 4 @ 2Ω
Front Speakers: SX165 NEO 6.5" SPL coaxial speakers
Rear Speakers: SX690H NEO 6×9 three-way speakers
Rear Speaker Power Handling: 130W RMS / 260W Peak
Rear Speaker Frequency Response: 65Hz – 24kHz
Speaker Sensitivity: up to 97 dB
Integration: HD A2B interface module

Professional Harley Audio Installation

Stereo Installs specializes in Harley-Davidson stereo upgrades and motorcycle audio installation.

Our shop installs motorcycle sound systems for riders across 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.