SYMPTOMS
You have an LHZ preamp (or any active preamp with ultralow current draw) and are experiencing unusual noise when a wireless transmitter is used. The noise can be anything from static, hiss, high-frequency whine, pops, clicks, dropouts, or audio fading in and out.
CAUSE
Wireless transmitters that use a 3-conductor TRS plug can cause noise issues. Several examples of these types of transmitters are shown below:
TRS plugs are most commonly found on transmitters that use internal rechargeable batteries. When not plugged into an instrument these plugs allow the transmitter to receive power from the dock to recharge.
Transmitters using TRS plugs include active circuitry that monitors the voltages on the RING and SLEEVE connectors to determine if it is being charged or if it is connected to an instrument with an active preamp. This active sensing circuitry needs a minimal amount of current to work correctly.
Most active electronics in guitars and basses consume several milliamps of current during use, which works well with the active sensing circuitry. HOWEVER, the LHZ preamp is an ultra-low current design just like the original Hazlabs preamp. The current usage is so small that the sensing circuity will not work correctly.
This results in a only a PARTIAL closure of the RING and SLEEVE circuit inside the transmitter, which will cause transmitter noise and noise from the electronic switch circuity to be inserted into the LHZ preamp.
RESOLUTION
We recommend using a female TS to make TS adapter cable such as the Pro Co EGLQF-08 or Pro Co EGLQF-1 adapter cable to prevent the transmitter from inserting noise into the preamp.