Aging Engineer

https://lhzpreamps.com

New for 2025: The LHZ-04 Preamp

The LHZ-04 preamp is a physical re-design of our current LHZ-03 model. It is the same circuit, same components, and same sound. Improvements for 2025 were driven by a significant number of clients using the LHZ in non-Spector basses with very confined control cavities. With smaller board dimensions and extremely…

LHZ-04 Install Manual

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. Don’t see the diagram you need? Let us know! CURRENT VERSION

LBCA-02 Active Blend Owners Guide

The LBCA-02 is an Active Balance Control designed to be used with Active pickups using modular DuPont-compatible cable connectors. The LBCA-02 works well with both the classic and X-series pickups from EMG™ as well as active pickups from most other manufacturers. The LHZ Preamp installation manual contains wiring diagrams for…

Spector® Bass Setup Procedures

INTRODUCTION The majority of these notes were written by Jim Eppard who is responsible for setting up USA Spector® basses in the NY workshop. He created these notes in response to requests from owners on the proper factory setup, and they’ve been my gold standard for maintaining my own Spector®…

LHZ History

I thought I’d take a few minutes to go through the progression of updates to the LHZ preamp since it’s inception in 2022. I laughingly tell people that I’ve “accidently started a business.” It’s framed as a joke, but the reality is exactly that: this was a personal project and…

HL-1 HAZard LAMPS Pedal by LHZ Preamps

Today we take a look at the HL-1 HAZard LAMPS Pedal, which is designed to give you that classic “Haz” tone on the floor. This pedal was designed for players using Spector® basses (with EQ dimed) who need to use a passive bass for a few songs. The HL-1 allows…

LHZ FAQ 02: What’s in the box?

In this we will go through a few of the most common questions regarding the LHZ-03 bass preamp: What’s in the box? Will it fit in my bass? How do I take the liner off the 3M VHB tape? One of the joys of this project is talking to players…

Barrel Jack Pin Identification and Wiring

One of the more common questions we receive are about how to solder the barrel jack. This can feel like a daunting task to players who’ve never soldered before or have limited electronics experience. Thankfully, it is not hard to do! This video walks through a couple concepts to make…