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…
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
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…
This video walkthru from 3 Random Monkeys takes us through the process of solderless installation of an LHZ preamp. Here’s the wiring diagram for an Active pickup setup using dual modular EMG volume pots used for the install.
This video is a walk-thru of the process of upgrading a American Fender Jazz Deluxe 5 String bass from the EMG BTS to the LHZ-03 preamp. This is NOT a typical installation because it as a custom modification to use a DPDT bypass switch. This allows the LHZ preamp to…
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…
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…
The HL-1 HAZard LAMPS pedal brings the unique tonal voice of the LHZ preamp into a pedal format. This pedal is intended for players with passive basses that want to give it the same punch and power as a USA Spector bass with an internal Hazlabs preamp. While it is…
View and Download the LHZ-03 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 PREVIOUS VERSIONS
The LHZ preamp does exactly what the original 80’s HazLabs did: the EQ was specifically tuned for US Spector® basses. The circuit design is unique in that the initial stage greatly boosts the treble before the EQ stage, and then that boost is removed. This causes the preamp to generate…
