Battery Drain Diagnostics

In this video we take a look at two of the most common reasons for rapid battery drain in a bass with an LHZ preamp. A 9 volt battery should last 6-8 months of normal use. However, certain wiring issues can cause an active preamp and pickups to always be…

OpAmp Comparison Results

In this video we’ll reveal the opamps that were used in the Blind Opamp Comparison video. This is a longish video, but it goes into a lot of the psychoacoustic challenges that make listening tests difficult (if not impossible) when the difference between the samples is small.

Blind Opamp Comparison

LHZ Preamps have transitioned from the vintage LF442CN opamps to new chips. The LF442CN has been out of production for many years, and Hazlabs have moved to modern surface-mount op-amps a few years ago, so it’s our time to turn the page as well! This video is a blind comparison…

Battery Voltage Impact on LHZ Preamp

In this video we answer the question “What happens to my active preamp when my battery dies?” This is a common questions from players buying a bass with active electronics for the first time. The good news is this: your preamp will NOT just die in mid performance! Instead, failing…

LHZ Preamp Sound

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…

EMG BQC vs LHZ

This is a quick audio comparison of the direct output of a Spector Rebop DLX 5 with a PJ pickup set (EMG 40P5 and EMG 40J) after switching from an EMG BQC preamp to the LHZ-01 HazLabs clone. Bass audio is recorded directly into a MOTU M4, with both samples…