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LHZ Preamps

LHZ Preamps

Vintage Bass Preamps

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Manuals & Wiring

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Preamp Identification: Find My Diagram

December 4, 2025December 7, 2025

Need to find the wiring diagrams for and older LHZ version? Not sure which one you have? No problem! Let’s start by figuring out which revision of board you have.

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  • Manuals & Wiring

Installation Planning Checklist

December 3, 2025December 4, 2025

A preamp upgrade can seem overwhelming when you open the cavity and see all the wires. It’s not bad at all, as long as you plan your install well. To make it easier, following is a general checklist for planning and installing your LHZ.

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  • Manuals & Wiring

LHZ-04 Install Manual

December 2, 2025December 4, 2025

View and Download the LHZ-04 Installation Manual right here!

This is a living document that is constantly being updated as we create new installation diagrams for clients that have unique wiring challenges.

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  • Manuals & Wiring

MID-03 Midrange Control Owner Manual

December 1, 2025December 7, 2025

View and Download the MID-03 Midrange Control Owner Manual right here!

The MID-03 plugs in between the output of your LHZ preamp and the output jack to give you the perfect midrange adjustment without impacting the clarity and articulation of the LHZ preamp.

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  • Manuals & Wiring

LBCA-02 Active Blend Owners Guide

November 30, 2025December 4, 2025

The LBCA-02 is an Active Balance Control that works well with both the classic and X-series pickups from EMG™ as well as pickups from most other manufacturers.

For more information about the LBCA-02, download the Owner’s Guide here.

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  • Manuals & Wiring

VOL-01 Volume Control User Manual

November 29, 2025December 4, 2025

The VOL-01 is a passive 25K volume control designed to receive input from low impedance Active pickups, our LBCA-02 Active Blend Control, or the EMG™ ABCX Blend Control.

Download the VOL-91 Owner’s Manual here.

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  • Manuals & Wiring

HL-1 HAZard LAMPS Manual

November 28, 2025December 4, 2025

The HL-1 HAZard LAMPS pedal gives passive basses the same punch and power as a USA Spector bass with an internal Hazlabs preamp.

While it is so simple that it really doesn’t need a manual, we made one anyway!

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