sub normal or not


crazy diamond

I have bit of a question ,i recently bought a s/hand sub ,a Wharfedale sw-15 (300w active),when i plug it in ,it is ok but when i connect the line in from my amp it starts to emit a low humming noise even with amp off ,when i asked the person i purchased it from he said it has always done this from new in fact even his new Rel does it.
All i was wondering is this normal or not?
Also has anyone got a manual for this model.

cheers Terry:confused: :confused:


It's a common problem with subs; do a search on 'earth loop mains hum' (or variations of - you'll soon get the gist) and you should soon come up with threads on the subject. Cured mine by earthing my AV receiver.

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