A new aftermarket head unit is a genuine upgrade for most Harley-Davidson touring bikes. Wireless Apple CarPlay, a high-brightness touchscreen, cleaner Bluetooth pairing, and — critically — a proper pre-amp output. These are real improvements over the factory unit.
But here's what most riders discover a few weeks after installation: the bike doesn't actually sound dramatically better. Music is clearer in some ways, the interface is better, but the raw audio performance at highway speed is still underwhelming.
That's not a defect in the head unit. It's a system problem — and once you understand why, the fix is straightforward.
What a New Head Unit Actually Changes (and What It Doesn't)
An aftermarket head unit like the Soundstream Reserve series outputs audio through two paths:
- Speaker-level outputs — direct to speakers, limited power
- RCA pre-amp outputs — a clean, low-noise signal at up to 5V, designed to feed an external amplifier
The 5V pre-amp output is the important one. It's substantially cleaner and higher-voltage than anything the factory radio produces — and it's what makes a proper aftermarket amplifier installation possible.
The problem: if you haven't added an aftermarket amplifier, that 5V pre-amp output isn't being used. Your new head unit is still driving the factory amp — or worse, driving the speakers directly through the speaker-level outputs — and the factory amp remains the limiting factor in the entire system.
The factory amplifier on most 2014–2023 Harley Touring models is significantly underpowered by aftermarket standards. It also applies its own EQ and dynamic limiting, which is tuned for stock speakers and actively works against a proper aftermarket setup.
In short: the head unit upgrade improves the source. But the amplifier is what actually drives the speakers.
What Adding a Cicada Amplifier Does
A Cicada Audio amplifier connects to the 5V RCA pre-amp outputs on your aftermarket head unit and does three things the factory amp cannot:
- Delivers real power. Cicada FLX amplifiers produce genuine rated output — enough headroom to drive upgraded speakers cleanly at highway speed without clipping or compression.
- Works from a clean source signal. Connected directly to the head unit's RCA outputs, the amp receives a flat, unprocessed signal before any speaker-level conversion. That's the foundation a good audio system needs.
- Gives you control. Gain structure, crossover points and channel assignment can all be set correctly — something that's not possible when you're working around the factory amp.
If you have a DSP-equipped Cicada amplifier (the FLX700.4PRO or FLX1400.4PRO), you also get time alignment, parametric EQ and crossover configuration in the same unit — which is what takes a loud system to a tuned system.
For a full breakdown of how Cicada amplifiers are specified and what the output ratings actually mean in a Harley installation, see: Cicada Motorcycle Amplifiers Guide for Harley Touring Bikes
Why Speaker Upgrades Complete the Picture
Factory Harley speakers are built to a specific impedance, sensitivity and frequency response profile — optimised for factory power levels and factory EQ curves. Once you've removed the factory amp from the signal chain and replaced it with a proper aftermarket unit, you're no longer working within those parameters.
Cicada Audio speakers are designed for exactly this environment: high-sensitivity drivers built for the Harley fairing and saddlebag positions, with the power handling to work correctly with the Cicada amplifier range. Every speaker in the Cicada range is designed to be driven properly — not padded for underpowered factory systems.
Practically, this means:
- Fairing speakers that project clearly at highway speed without harshness
- 6×9″ saddlebag speakers that add rear stage fill without overpowering the front
- Horn-loaded options (the CHX series) for riders who need genuine highway-speed projection in wind
For a guide to which speaker suits which position and riding style: Cicada Motorcycle Speakers Guide for Harley Riders
The Full Upgrade Path: Head Unit → Amplifier → Speakers
For 2014–2023 Harley Touring models, the logical upgrade sequence is:
- Head unit — establishes a clean 5V source signal, adds CarPlay, handles the interface
- Amplifier — receives that signal and delivers proper power to the speakers
- Speakers — convert that power into audio that performs at speed
If you've already completed step one, Cicada complete kits are worth looking at for steps two and three. These pair a matched Cicada amplifier and speakers in one purchase, pre-matched for impedance and power handling, with wiring harness and mounting hardware included. The system design work is done — you're executing the install, not researching compatibility.
A Note on 2024+ Touring Models
The above applies to 2014–2023 models running Boom! Box or Soundstream head units. The 2024+ Harley-Davidson Touring platform (Skyline OS) works differently.
On 2024+ bikes, there is no aftermarket head unit option — the Skyline OS system uses a digital A2B audio bus that makes conventional head unit replacement impractical. The upgrade path on these bikes starts with the NAV-TV ZEN-H A2B interface, which extracts a clean signal from the factory digital network and converts it to analogue RCA outputs for an aftermarket amplifier.
For a full explanation of why 2024+ bikes need a different approach: Why 2023.5+ Harley Audio Upgrades Need an A2B Interface
Summary
A new head unit is the right first move on a 2014–2023 Harley touring bike. It improves the source signal, adds modern connectivity, and — importantly — creates the pre-amp output that makes a proper amplifier installation possible.
But the head unit alone doesn't replace the factory amp. That step requires a dedicated aftermarket amplifier receiving the RCA signal, driving speakers that are built to perform at the power levels involved.
The complete system — head unit, amplifier, speakers — is what actually transforms Harley audio from "better than stock" to "genuinely good at highway speed."
Browse the Cicada range: Amplifiers · Speakers · Complete Kits