MAA 4-Channel T-Harness – SoundStream HDHU.V2 & WHD14+/UNLOC to Hertz SP Amplifiers (2014–2023 Harley Touring)
$250.00 AUD
SKU: MAA-V2-HZ-WH
4-channel T-harness for 2014–2023 Harley-Davidson® Touring – SoundStream HDHU.V2, or WHD14+ with the WHD.UNLOC kit, to a Hertz SP-series amplifier
This harness does the whole amplifier connection in one part. It takes all four speaker-level outputs from a SoundStream HDHU.V2, or a WHD14+ running the WHD.UNLOC kit, feeds them to a Hertz SP-series amplifier, and returns the amplifier's output into the factory speaker harness. The Maestro RR/RR2 connection is carried in the same loom, so gauges and thumb control keep working. Nothing on the bike is cut or spliced.
Two things decide which harness you need: your head unit and your amplifier. This one is built for the Hertz SP series. If you are running a Cicada Audio® amplifier instead, you want the Cicada version. If your WHD14+ is running without the UNLOC kit, see the WHD14+-only Hertz harness.
Who This Is For
You are running, or about to run, a SoundStream HDHU.V2 or WHD14+ in the fairing of a 2014–2023 Harley-Davidson® Touring bike, with a Hertz SP-series amplifier mounted in the fairing behind it. On a WHD14+ build the WHD.UNLOC kit is required – this harness plugs into the Maestro RR2 module that comes with it, and will not suit a WHD14+ running without the kit.
What This Is Best For
- Built for the Hertz SP series – the amplifier end is terminated for the SP-series input, so it drops straight onto a Hertz SP 4.500 or SP 4.900 without hand-wiring the input plug. Step up from the 4.500 to the 4.900 later and the harness carries over.
- Signal out and speaker return in one loom – a true T-harness, not a one-way signal lead. Four channels of speaker-level output go to the amplifier, and the amplifier's output comes back through the harness into the factory speaker loom.
- Maestro integration stays intact – the module connection is part of the loom rather than a separate splice, so thumb wheel volume, track skip, gauges and CAN-bus data behave exactly as they did before the amplifier went in.
- Nothing gets cut – head unit loom, OEM speaker harness and amplifier input plug all stay factory. Spliced-in signal tails are the most common reason a used bagger's audio has to be unpicked and rebuilt.
Which Harness Do You Need?
Every one of these suits 2014–2023 Touring, so the model year will not tell you which to order. Two things decide it. Your head unit: an HDHU.V2, or a WHD14+ with the WHD.UNLOC kit, needs the Maestro leg – that is this harness. A WHD14+ running on its own does not, and takes the WHD14+-only version. Your amplifier: this harness is terminated for the Hertz SP series; for Cicada Audio® amps see the Cicada version. Still running the factory Harley radio? Neither of these suits – call us on 07 3350 1354.
The Bottom Line
Four channels out, amplifier output returned to the factory loom, Maestro integration carried through, and the whole thing reversible. It removes the stage of the install where noise problems and control faults get introduced. Add to cart above – the amplifier still needs its own power and earth run, covered below.
Fitment
| Head Unit | Module Requirement | Years |
|---|---|---|
| SoundStream HDHU.V2 | Maestro RR or RR2, sold separately | 2014–2023 |
| SoundStream WHD14+ | WHD.UNLOC kit required – Maestro RR2 included in that kit | 2014–2023 |
How the Harness Sits in the System
The loom has three ends rather than two. The head unit end takes four channels of speaker-level output from the SoundStream unit's own Class-D output section and carries them to the amplifier's input stage without converting to line level first. The amplifier end returns the Hertz amplifier's speaker output back into the factory harness, so the OEM speaker wiring downstream of the radio is used exactly as Harley-Davidson® built it. On the road: fewer conversion stages between source and amplifier means fewer places for noise to enter, and it shows up most at idle, when alternator whine is at its most audible through a fairing.
The Maestro RR/RR2 connection runs inside the same loom, terminated to the module rather than tapped alongside it. On the road: the gauge cluster and the thumb controls keep behaving as one system rather than as an aftermarket stereo bolted next to a motorcycle.
Terminations are machine-crimped, strain-relieved and continuity-tested before dispatch. On the road: hand-soldered joints work-harden under constant fairing vibration and fail intermittently – a channel that drops out over rough bitumen and then tests perfectly back in the workshop.
Technical Specifications
| Type | 4-channel T-harness – head unit to amplifier, amplifier to OEM speaker loom |
| Head Unit Compatibility | SoundStream HDHU.V2; SoundStream WHD14+ with WHD.UNLOC kit |
| Amplifier Compatibility | Hertz SP-series amplifiers |
| Channels | 4 |
| Signal Level | Speaker level |
| Module Integration | iDataLink Maestro RR and RR2 – module not included |
| Amplifier Location | Fairing mount |
| Carries Amplifier Power / Earth | No – separate power and earth run required |
| Vehicle Fitment | 2014–2023 Harley-Davidson® Touring |
| Warranty | 2 years |
In the Box
- 1 × MAA Soundstream-to-Hertz 4-channel T-harness, assembled and tested
The Maestro module, the WHD.UNLOC kit and the amplifier power and earth kit are sold separately.
Completing the Install
The amplifier needs its own power and earth run from the battery – the 8-Gauge Premium Fairing-Mounted Amp Power Harness with Disconnect is the matching part for a fairing-mounted amp, and its inline disconnect turns fairing removal into a one-plug job.
Because the harness hands the amplifier's output back to the factory loom, fairing speakers are already taken care of. Rear speakers depend on how your bike is wired – some configurations run the rear channels through to the saddlebags or Tour-Pak® on their own, and some need a separate backbone harness to get there. The SaddleTramp BC-9720 Rear Speaker Backbone Harness is the usual answer, with the Deluxe Rear Speaker Split Backbone Harness for builds running Tour-Pak® and saddlebag speakers together. If you are not sure which applies to your bike, call us before ordering.
Australia Shipping:
- Under $500 → $19.95
- $500–$2,500 → $14.95
- $2,500 and above → FREE
- Bulky items → +$25 surcharge (waived once your order reaches $2,500)
Fast dispatch from Brisbane. In-stock orders placed before 1pm AEST usually ship the same business day.
Change of mind: Request a return within 30 days of delivery. The product must be unused, unopened and in its original sealed packaging, valued at $50 or more, and you'll need an RMA number from us before sending anything. Return freight is yours, and a restocking fee of up to 15% may apply – we'll confirm any fee before the return is accepted.
Not returnable for change of mind: opened, installed or test-fitted items, special-order and custom products, custom harnesses, completed tuning, gift cards and items under $50.
Fitment: If we confirmed fitment in writing based on accurate bike details and it doesn't fit, we'll put it right and cover reasonable freight. Not sure? Ask us before you order – we're happy to help.
Faulty, damaged or wrong item: Contact us first with your order number. Faults follow our RMA and warranty process, and none of this affects your rights under the Australian Consumer Law.