Description
Rewiring a bass with loose pots, a preamp board, and a rat’s nest of wire is nobody’s idea of fun. Bartolini’s HR5.4/918 harness skips that whole ordeal — every connection is already made, every control is already matched to the preamp, so you’re really just mounting hardware and dropping in a battery.
At the core is Bartolini’s 3-band EQ preamp, wired to run on either 9V or 18V depending on how much headroom and clarity you want out of your rig. The control layout is straightforward once you see it laid out: two knobs handle Volume and Blend, while four positions cover Treble, Mid (with a 3-frequency toggle for dialing in exactly where that midrange bump sits), and Bass. That mid-frequency switch is the real sleeper feature here — it lets you reshape the character of the EQ without needing a soldering iron every time you change your mind.
Because this is a complete harness rather than a bare preamp module, there’s no guessing on pot values, no chasing down the right capacitors, and no risk of a wiring mistake frying your electronics. Bartolini builds these in San Luis Obispo, California, using the same audio-grade potentiometers and preamp circuitry found across their pro lineup — the stuff luthiers spec into custom builds and that repair shops trust for reliable upgrades.
- 3-band EQ preamp, 9V/18V switchable
- Volume – Blend control layout
- Treble – Mid (3-freq toggle) – Bass tone controls
- Includes second battery clip for 18V operation and wiring instructions
If you’re upgrading an existing Bartolini-equipped bass or building out a passive one, this harness gets you to active tone with a lot less bench time.
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