2023–2025 Harley Road Glide 3 Audio Upgrade Guide

Model Guide · Road Glide 3 (2023-2025)

Upgrading the audio on a 2023-2025 Road Glide 3 starts with identifying the factory radio, the fairing speakers and whether the bike has been modified. This guide covers the Boom! Box GTS Road Glide 3 (FLTRT), its two-speaker Sharknose fairing system, factory and upgrade speaker sizes, amplifier mounting, DSP tuning and how to plan an upgrade, including what a rear zone really involves.

Important model note: The Road Glide 3 was introduced for the 2023 model year and, through 2025, uses Boom! Box GTS with two 5.25-inch fairing speakers driven at 25 watts per channel. It integrates like other Boom! Box Touring bikes and does not need an A2B interface. The redesigned 2026 Road Glide 3 is a different platform on Skyline OS, covered in the 2026 Skyline trike guide, so confirm your exact year before choosing parts.

Quick answer

The 2023-2025 Road Glide 3 uses Boom! Box GTS with a 6.5-inch display and a two-speaker fairing system: two 5.25-inch speakers in the Sharknose fairing, with no factory rear speakers. Purpose-built 6.5-inch Harley fairing speakers are the common upgrade. It does not need an A2B interface, the amplifier mounts under the seat or to the frame rather than in a saddlebag, and any rear-speaker expansion is custom fabrication rather than a bolt-in kit.

Choose your trike: 2014-2025 Tri Glide Ultra · 2023-2025 Road Glide 3 (this guide) · 2026 Skyline trikes

Factory audio specifications and model-year boundaries checked against Harley-Davidson technical material, 1 September 2026.

Jump to: Factory audio · Speaker size · Rear speakers · Amplifier mounting · Upgrade paths · FAQs

2023-2025 vs 2026 Road Glide 3 Audio Systems

Model and platform Factory starting point Integration approach
Road Glide 3 (FLTRT), 2023-2025 Boom! Box GTS with two 5.25-inch fairing speakers at 25 W per channel; no factory rear speakers Boom! Box integration; no A2B interface required
Road Glide 3, 2026 (redesigned) Skyline OS, two 5.25-inch fairing speakers (see the 2026 Skyline trike guide) Skyline / A2B integration

Specification note

One Harley-Davidson 2025 technical table lists four speakers, but Harley's model feature material describes a two-speaker Boom! Box GTS system, and the Road Glide 3 has no factory rear speaker location. The correct factory layout is two 5.25-inch speakers in the Sharknose fairing.

Any EQ, filtering, clipping or volume-dependent behaviour in the factory system should be measured rather than assumed.

Road Glide 3 Speaker Size and 6.5-Inch Upgrade Fitment

The factory speakers are 5.25-inch (133 mm) drivers, but the 2015-2023 Sharknose mounting architecture accepts purpose-built 6.5-inch Harley fairing speakers. That makes 6.5-inch the common upgrade size for the 2023-2025 Road Glide 3, but it does not mean any generic 6.5-inch speaker will fit. Basket profile, mounting pattern, depth, terminals, impedance and grille clearance still need to suit the Road Glide fairing, so confirm the specific product for your year before ordering. Speakers, amplifiers and integration parts confirmed for this bike are grouped in our 2023-2025 Road Glide 3 audio upgrades collection.

Factory speaker size and upgrade speaker size are two different facts: the original driver is 5.25-inch, while a compatible 6.5-inch model can mount in its place. The rear trunk is not an existing speaker position and should not be treated as one. For factory speaker sizes across every Harley Touring era, see: What Size Speakers Does My Harley Have? Factory Speaker Sizes by Year and Model.

Does the Road Glide 3 Have Rear Speakers?

No. The 2023-2025 Road Glide 3 is a two-speaker system, with two 5.25-inch speakers in the Sharknose fairing and no factory rear speakers. The weatherproof rear trunk is not a factory speaker enclosure. Always check a used or previously modified bike individually, in case aftermarket rear speakers have already been fitted.

Can You Add Rear Speakers to a Road Glide 3?

Only through custom mounting or fabrication. There is no standard factory rear pod, Tour-Pak position or saddlebag lid to reuse. Any enclosure must be securely mounted and must not compromise the trunk's weather sealing, structural panels, storage access or passenger safety, and it needs its own wiring and amplifier channels. Until a specific enclosure and mounting method are confirmed, rear speakers should be treated as custom fabrication rather than a normal bolt-in upgrade.

What a Speaker-Only Upgrade Can and Cannot Change

A correctly matched speaker upgrade can improve clarity, efficiency, weather resistance and usable output while retaining the original Boom! Box GTS system. On the Road Glide 3, however, the factory radio provides only 25 watts per channel, so the speaker must be efficient and electrically appropriate if it is expected to perform well without an external amplifier. A speaker-only change cannot add amplifier headroom, provide DSP control or create a rear zone. Where more output is the goal, speakers, source integration and amplification should be planned together, with enough amplifier channels and clean power: problems arise when speakers are added in parallel, the impedance falls below the amplifier rating, or the system is asked to produce more output than its power supports.

Learn when a Harley radio flash, line leveller or DSP input correction is the right solution.

How DSP and OEM Integration Help

The factory signal can be measured and then conditioned using a suitable DSP, DSP amplifier or integration device. If a rear zone is added, a processor with enough channels allows the fairing and rear speakers to be controlled separately, including independent level, equalisation, crossover control, channel routing and time alignment.

Where multiple speaker locations are used, time alignment can manage arrival-time differences between them for a chosen listening priority, usually the rider, or provide a compromise for two-up use. It cannot perfectly align every seating position simultaneously. A DSP cannot repair a source signal that is already clipping, restore dynamics removed by source-level compression, or change a speaker's physical direction. The source's maximum clean volume and usable response must be established during setup.

DSP Tuning for Harley Baggers (Explained Simply)

Where Does the Amplifier Mount on a Road Glide 3?

The Road Glide 3 has no saddlebags available for the amplifier locations commonly used on two-wheel Road Glide builds. A trike system therefore needs a dedicated under-seat or frame-mounted amplifier solution, with the exact bracket, position and wiring route matched to the amplifier and system design.

Do not assume that a Road Glide amplifier rack or saddlebag wiring kit will transfer simply because the front fairing looks similar. The speaker platform may share parts with the 2015-2023 Road Glide, but amplifier mounting and rear wiring are trike-specific. Higher-output builds should also include an electrical-load review and properly planned power and ground wiring.

Upgrade Paths: Choose by Your Goal

Path 1: Front Fairing Improvement

Confirmed direct-fit fairing speakers with the existing radio and amplifier configuration checked. Suitable for a modest, clean front-stage improvement without a larger build, provided the speaker suits the 25-watt factory radio.

Path 2: Amplified Front Stage

Fairing speakers with an external amplifier or DSP amplifier, correct source integration (radio flash or input correction), trike-specific amplifier mounting and a proper gain and crossover setup.

Path 3: Add a Custom Rear Zone

Because the Road Glide 3 has no factory rear speaker position, this path builds a rear zone from scratch with a confirmed enclosure or pod solution, its own amplifier channels and matched speakers, managed by a DSP or DSP amplifier. Matching the rear speakers to the fairing in sensitivity and tone matters for two-up riding and for balancing against road noise. Treat this as fabrication work, not a kit.

Path 4: Full System

Fairing and any added rear speakers, optional subwoofer, sufficient amplifier channels, a DSP for routing, level control, integration and tuning, and an optional aftermarket head unit where the platform supports it. A subwoofer requires a suitable enclosure or custom mounting location, dedicated amplification and an electrical-load review. The rear trunk should not be treated as a ready-made subwoofer enclosure without assessing its construction, sealing, ventilation and effect on usable storage.

Replacing Boom! Box GTS may add modern features and cleaner aftermarket outputs, but retaining handlebar controls does not automatically retain every factory function. Confirm rider and passenger headset support, intercom, vehicle information, USB, radio controls and any other required functions before selecting a replacement head unit and integration module.

Stock Harley Radio vs Aftermarket Head Units

Tuning for Road Noise and Two-Up Riding

Where a trike produces more road noise, and where the rider and passenger sit in different positions, independent levels, crossovers and EQ help balance the system. Time alignment can then be set for a chosen listening priority, typically the rider, or as a two-up compromise. A DSP that supports multiple presets is useful: one preset for solo riding and another for two-up touring.

Frequently Asked Questions

Does a 2023 Road Glide 3 use Boom! Box GTS?

Yes. The Road Glide 3 launched for the 2023 model year with Boom! Box GTS and a 6.5-inch touchscreen, and it kept Boom! Box GTS through 2025. The 2026 Road Glide 3 was redesigned onto Skyline OS.

How many speakers does a 2023-2025 Road Glide 3 have?

Two. The 2023-2025 Road Glide 3 has two 5.25-inch speakers in the Sharknose fairing and no factory rear speaker position.

Can 6.5-inch speakers fit a 2023-2025 Road Glide 3?

Purpose-built 6.5-inch Harley fairing speakers designed for the 2015-2023 Sharknose mounting architecture can mount in place of the factory 5.25-inch drivers. A generic 6.5-inch car speaker is not guaranteed to fit, so confirm the specific product's mounting, depth, impedance and grille fitment for the Road Glide fairing.

Does a 2023-2025 Road Glide 3 have rear speakers?

No. It has two fairing speakers and no factory rear zone. The rear trunk is not a factory speaker enclosure. Check a used bike individually in case aftermarket rear speakers have already been fitted.

Can rear speakers be added to a Road Glide 3?

Only as custom fabrication. There is no factory pod, Tour-Pak position or speaker lid to reuse, so a rear zone needs a purpose-made enclosure or mounting solution that preserves the trunk's sealing, structure, storage and passenger safety, plus its own wiring and amplifier channels.

Where does the amplifier mount on a Road Glide 3 trike?

Under the seat or to the frame, using a trike-specific bracket and wiring route. The Road Glide 3 has no saddlebag amplifier locations, so racks and wiring kits built for a two-wheel Road Glide do not transfer across.

Does a 2023-2025 Road Glide 3 need an A2B interface?

No. The 2023-2025 Road Glide 3 uses Boom! Box GTS, which does not use the Skyline OS / A2B network. An A2B interface is only needed on the 2026 Skyline OS Road Glide 3 and the other 2026 Skyline trikes.

Is the Road Glide 3 the same audio platform as a 2015-2023 Road Glide?

Partly. The Sharknose fairing and Boom! Box GTS radio are shared, so fairing speaker fitment overlaps with the 2019-2023 two-wheel Road Glide. The trike's amplifier mounting, rear body and rear wiring are different, so amplifier racks, saddlebag speaker kits and rear harnesses for the two-wheel bike cannot be assumed to fit.

What is the difference between the 2023-2025 and 2026 Road Glide 3 audio?

Both are two-speaker fairing systems, but the 2023-2025 Road Glide 3 uses Boom! Box GTS with no A2B requirement, while the 2026 Road Glide 3 was redesigned onto Skyline OS with a 12.3-inch display, two 5.25-inch fairing speakers and a digital A2B network, so amplifier or DSP additions need an A2B interface.

Shop this setup

Upgrading a 2023-2025 Road Glide 3? The factory system is a two-speaker fairing setup, so most builds start with the fairing speakers.

Not sure what fits your bike? Contact Motorcycle Audio Australia with your year and factory radio, and we'll confirm the right parts.

Plan your Road Glide 3 audio system

Riding one of these? Tell the System Builder your model and year and it will match the whole system, from fairing speakers and amplification to wiring, trike-specific mounting and Boom! Box integration, and price it.

Build your system →

Prefer us to spec it, or want a custom rear zone? Talk to us about a custom build →

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