2024+A2B interfacemodel guideRoad GlideSkyline OSStreet Glide

2024+ Skyline OS Harley Touring Audio Upgrades: What Actually Works

Model Guide · 2024+ Skyline Touring

The 2024 Harley-Davidson Touring redesign changed how audio is routed between the head unit, amplifier and speakers, so upgrading a Skyline OS bike is not the same job as a 2014-2023 model. This guide explains how to tell what platform you have, why the A2B audio network matters, what speakers and amplifiers the new platform needs, and the complete upgrade paths.

Important model note: The deciding factor is the infotainment system, not the year on your registration. Skyline OS bikes have a wide 12.3-inch touchscreen and use a digital A2B audio network; Boom! Box GTS bikes have a 6.5-inch screen and integrate the older way. The standard 2024 Street Glide and Road Glide moved to Skyline OS, but not every 2024 Touring model did: the 2024 Ultra Limited and 2024 Tri Glide Ultra retained Boom! Box GTS. Identify the platform by the actual infotainment system rather than the registration year alone.

Quick answer: If your bike has the wide 12.3-inch Skyline OS display, audio runs over a digital A2B network, so adding an amplifier or DSP normally needs a compatible A2B interface (a speaker-only swap using the factory amplification does not automatically need one). The standard Street Glide and Road Glide have two 5.25-inch fairing speakers. Skyline OS supports wired or wireless Apple CarPlay (Harley does not list Android Auto), and there is no aftermarket head-unit replacement for the platform, so you keep the factory head unit and focus on speakers, amplification and an A2B interface.

Looking for a 2026 Road Glide 3 or Street Glide 3 Limited trike? See the dedicated 2026 Skyline trike audio guide.

How to Tell If Your Bike Is Skyline OS

The quickest check is the screen. Skyline OS uses a wide 12.3-inch full-colour TFT touchscreen; Boom! Box GTS uses a 6.5-inch screen. Skyline OS first appeared on the redesigned 2023 CVO Street Glide and CVO Road Glide. It expanded to the standard Street Glide and Road Glide for 2024 and is now used across additional CVO, Limited and trike models. If your bike has Skyline OS, this guide applies regardless of the year on your registration. If it has Boom! Box GTS, use the relevant Boom! Box model guide rather than this Skyline guide: that includes the 2014-2023 Street Glide and 2015-2023 Road Glide guides, the Ultra & Electra Glide guide and the Tri Glide Ultra guide.

Model group Typical platform Important note
2023 CVO Street Glide / Road Glide Skyline OS First Skyline-equipped Touring models
2024-2026 standard Street Glide / Road Glide Skyline OS Two 5.25-inch fairing speakers on standard models
2025 Street Glide Ultra Skyline OS Two 5.25-inch fairing speakers; an Ultra badge does not mean a factory rear-speaker zone
2024 Ultra Limited Boom! Box GTS Not part of the Skyline redesign
2024-2025 Tri Glide Ultra Boom! Box GTS See the Tri Glide Ultra guide
2026 Street Glide Limited Skyline OS Four 6.5-inch speakers: two fairing and two Grand Tour-Pak
Skyline CVO and CVO ST Skyline OS Speaker count and amplification vary by exact model

Model range and factory audio specifications checked against Harley-Davidson Australia, July 2026.

The A2B Audio Network: What Changed and Why It Matters

The most significant change for audio upgrades is the A2B (Automotive Audio Bus) digital audio network. On many Boom! Box systems, aftermarket amplification can be integrated using the radio's speaker-level outputs or an appropriate line-level or OEM-integration device, and factory-amplified or premium audio configurations may require additional wiring or bypass work. Skyline OS adds a digital A2B link between the infotainment and amplifier architecture, so the older integration method cannot simply be assumed to apply.

Adding an external amplifier to a Skyline OS Harley normally requires a compatible A2B interface that provides usable analogue line-level outputs for an aftermarket amplifier or DSP. The NAV-TV ZEN-H is one available interface, but fitment should be confirmed for the exact model year and factory-audio package before ordering. Without the correct interface or bypass strategy, amplifier installation will not work correctly regardless of the amplifier brand.

For a detailed technical explanation: Why 2023.5+ Harley Audio Upgrades Need an A2B Interface.

What Else Changed on the 2024+ Platform

Beyond the A2B network, the redesign changed several things that affect upgrade compatibility:

  • Fairing architecture: revised Batwing (Street Glide) and Sharknose (Road Glide) fairings with new speaker positions and mounting points. Previous-generation adapters and mounts should not be assumed to carry over.
  • Speaker cutouts: different fairing openings to previous models, so speaker fitment must be confirmed specifically for the redesigned platform, not assumed from 2014-2023 compatibility.
  • Skyline OS integration: the new infotainment system changes how aftermarket interfaces communicate with the bike, so not all previous-generation solutions are compatible.
  • Wiring connectors: the harness design has changed, so use a platform-specific harness confirmed for the exact Skyline model. 2014-2023 model-specific harnesses should not be assumed to fit.

What Size Speakers Fit a Skyline OS Harley Touring?

Standard Skyline OS Street Glide and Road Glide models introduced from 2024 use two 5.25-inch fairing speakers at 50 watts per channel, with no factory rear or saddlebag speakers. The 2025 Street Glide Ultra also uses two 5.25-inch fairing speakers, despite its full-dresser Ultra badge. Other Skyline models vary significantly. Some CVO ST models retain a two-speaker layout but use larger 6.5-inch speakers and stronger factory amplification, while Limited and full-dress CVO models may add Tour-Pak, lower-fairing or other speaker zones.

Do not determine speaker size or amplifier requirements from the CVO, ST, Ultra or Limited badge alone. Confirm the exact model year, speaker locations, impedance and factory amplifier configuration. A generic car speaker is not guaranteed to fit the redesigned fairing, so confirm mounting, depth, terminals, impedance and grille fitment for the specific model. For factory speaker sizes across every Harley Touring era, see: What Size Speakers Does My Harley Have? Factory Speaker Sizes by Year and Model.

Why Speaker Upgrades Are the Clearest Starting Point

Speaker replacement on the Skyline OS platform is more straightforward than amplifier integration, provided the speakers are confirmed compatible with the new fairing positions. A well-matched, confirmed-compatible speaker can improve clarity, weather resistance and usable frequency response. The result still depends on impedance, sensitivity, installation and the factory power available, and it is the most accessible first step.

The limitation is that speaker replacement alone does not add amplifier power or headroom, or change how the source is integrated. Riders who want sustained, balanced output usually address the speakers, available power and source integration (via the A2B interface) as part of the same build.

Learn why a compatible A2B interface is normally required when adding aftermarket amplification to a Skyline OS Harley.

Amplifier Integration on Skyline OS Models

External amplifier integration on a Skyline OS bike is possible, but it requires a compatible A2B interface between the head unit and the amplifier. The interface provides usable analogue line-level outputs that a conventional amplifier can receive. The path is:

  • The A2B interface receives the digital audio signal from the head unit
  • The interface outputs a usable analogue line-level signal
  • The external amplifier receives and amplifies that signal
  • The amplifier drives the upgraded speakers in the standard way

The interface adds cost and installation complexity, but a well-selected and correctly configured interface does not prevent a high-quality amplified system. The final result still depends on interface compatibility, the factory-system configuration, amplifier and DSP selection, speaker fitment, electrical capacity, and correct installation and tuning.

How DSP and OEM Integration Help

Once the A2B interface provides usable outputs, a suitable DSP or DSP amplifier lets you tune the system properly, with independent level, equalisation, crossover control, channel routing and time alignment. On the multi-zone Limited and CVO bikes, a processor with enough channels lets the fairing and rear or Tour-Pak zones be tuned separately.

The interface output level, DSP input range and downstream amplifier gain structure must be established during setup. 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.

DSP Tuning for Harley Baggers (Explained Simply)

Apple CarPlay on Skyline OS

Skyline OS supports wired or wireless Apple CarPlay. There is currently no aftermarket head-unit replacement for the Skyline platform, so you keep the factory infotainment system; for iPhone users, CarPlay covers phone integration without a head-unit change. Harley-Davidson's guidance is that a compatible headset must be paired to the bike for Apple CarPlay to operate. For a full rundown of what it does, see What Is Apple CarPlay and What Can It Do?

Android Auto is not listed as a supported Skyline OS feature. Android-phone users can still use standard Bluetooth phone and media functions, but should not expect the factory display to provide Android Auto (see What Is Android Auto and What Can It Do?). On this platform the upgrade focus shifts to speakers, amplification and the A2B interface rather than the head unit.

Upgrade Paths: Choose by Your Goal

Path 1: Front Fairing Improvement

Confirmed direct-fit fairing speakers with the factory system checked. The most accessible upgrade, and the clearest starting point on the two-speaker standard bikes. A confirmed speaker-only replacement that retains the factory amplification does not automatically need an A2B interface.

Path 2: Amplified Front Stage

Fairing speakers with an external amplifier or DSP amplifier, a compatible A2B interface or other confirmed integration strategy for the exact factory-audio package, platform-specific harnesses and a proper gain and crossover setup.

Path 3: Multi-Zone Front and Rear

On Limited and CVO trims with rear or Tour-Pak speakers, matched speakers on their own amplifier channels, managed by a DSP or DSP amplifier with enough outputs to run the zones independently, through the A2B interface.

Path 4: Full System

Fairing and rear speakers, optional subwoofer, sufficient amplifier channels, a DSP for routing, level control, integration and tuning, and the correct A2B interface throughout.

What Actually Works on Skyline OS Touring Models

  • Confirm the platform first: wide 12.3-inch Skyline OS (A2B) versus 6.5-inch Boom! Box GTS (older integration)
  • Speaker upgrades using products confirmed for the redesigned fairing positions
  • When retaining Skyline OS and adding an aftermarket amplifier or external DSP, use a compatible A2B interface or other confirmed integration strategy for the exact factory-audio package
  • Platform-specific wiring harnesses throughout
  • DSP tuning after the interface provides usable outputs

The most important principle on this platform: confirm compatibility for the Skyline OS architecture and your exact model specifically before purchasing any component. Do not assume compatibility from previous-generation fitment or from the model badge.

Frequently Asked Questions

How do I tell if my bike has Skyline OS or Boom! Box GTS?

Look at the screen. Skyline OS uses a wide 12.3-inch full-colour TFT touchscreen; Boom! Box GTS uses a 6.5-inch screen. The screen, not the model year, decides which integration method your bike needs.

Does Harley Skyline OS support Android Auto?

No. Harley-Davidson lists wired and wireless Apple CarPlay for Skyline OS, but does not list Android Auto. Android users can use Bluetooth phone and media functions.

Does Apple CarPlay require a headset on Skyline OS?

Harley-Davidson's guidance is that a compatible headset must be paired with the bike for Apple CarPlay to operate. Confirm your setup before relying on CarPlay.

Does my 2024 Street Glide or Road Glide need an A2B interface?

If it has the wide 12.3-inch Skyline OS display, then to add an external amplifier or DSP you normally need a compatible A2B interface confirmed for your exact model and factory-audio package. The standard 2024 Street Glide and Road Glide are Skyline OS bikes.

Can I upgrade Skyline speakers without an A2B interface?

Yes. A confirmed, compatible speaker-only replacement using the factory amplification does not automatically require an A2B interface. An interface is normally needed when adding aftermarket amplification or an external DSP while retaining Skyline OS.

Does a 2024 Ultra Limited use Skyline OS?

No. The 2024 Ultra Limited retained the 6.5-inch Boom! Box GTS platform. The standard 2024 Street Glide and Road Glide moved to Skyline OS.

Does the 2025 Street Glide Ultra have rear speakers?

Harley-Davidson's published specifications list two 5.25-inch fairing speakers. Do not assume that the Ultra name means it has a factory Tour-Pak speaker system; confirm the actual speaker locations before ordering.

Which Harley models first received Skyline OS?

The redesigned 2023 CVO Street Glide and CVO Road Glide introduced Skyline OS, followed by the standard Street Glide and Road Glide for 2024.

What size speakers are in a standard Skyline Street Glide or Road Glide?

The standard Skyline OS Street Glide and Road Glide use two 5.25-inch fairing speakers at 50 watts per channel, with no factory rear speakers. Limited and CVO trims vary, so confirm what is fitted to your exact model.

Will my 2014-2023 speakers, amp harness or adapters fit a Skyline bike?

Platform-specific 2014-2023 harnesses, brackets, speaker adaptors and complete kits should not be assumed to fit the redesigned Skyline platform. A bare speaker, amplifier or DSP may still be usable if its dimensions, impedance, electrical requirements and installation method are confirmed for the exact bike.

Can I still add an amplifier and DSP to a Skyline OS bike?

Yes. With a compatible A2B interface providing usable analogue outputs, you can add an external amplifier and a DSP and tune the system. A well-selected and correctly configured interface does not prevent a high-quality amplified system.

Planning a Skyline OS Touring Audio Build?

Tell us your exact model and year, confirm your screen is the wide 12.3-inch Skyline OS display, and whether the bike has a factory amplifier, and we'll put together a speaker, amplifier, DSP and A2B interface combination confirmed for the Skyline platform.

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