ThruPower Noise

Due to their smaller chokes, ThruPower modules may make more noise under load than traditional dimmer modules such as D20s. However, there have been cases when chokes have come loose after manufacturing, and have become very loud as a result. If a ThruPower module is making a very loud buzzing noise, try removing the module from the rack and tightening down the screws in the black plastic choke retainers.