mordant short msw20 humming



Posting this for a mate who has a mordant short msw20 sub with a hum when not in use, when he touches the amp panel the hum stops...any ideas on a fix please guys??



Standard Member
Sounds like an earthing (earth loop) issue; when someone touches the amp they provide an earth and the humming ceases. The amp itself may not be earthed; try connecting a single wire to the casing (it may have a ground connection on the back) and the other end to the earth (make sure it is the earth) in 3-pin plug. Plug it into a wall socket, and the hum should disappear.

This just worked for me.
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