jas

Put it in the bin where it belongs.

probably the foam surround has deteriorated pull the mesh cover off and check foam, amp could still be ok.

i got the old promedia 2.1 and yeah the sub is shite...anyway the manual states, Periods of non-use. The device should be unplugged from the wall outlet when it is not in use for extended periods. Lol whats klipsch definition of extended periods.

tried some music without the satellite speakers connected and at 20% volume the bass sounds bad there's flapping that shouldn't be there.

i got my Promedia 2.1 set back in 2002 and used it for 2 years then put away in the cupboard they still look new, i tried them out recently and having same issue with the sub. after switching on the sub it works for about 20 seconds then cuts out...if i switch the sub off immediately then on again it stills doesn't work, i have to allow a few minutes before turning the sub on again for it to work for yet another 20 seconds then it cuts out again.. any knowledge on what component is failing?