i have an old samick 15w practice amp with reverb
i tried to put a sub on it 2 use as a bass amp, it didnt work* so i put the original speaker back on.
now wen th amp is turned on there is a constant hum about as loud as 5-10% volume, this does not change at all wen any controls are fiddled with, even vol on 0. nothing different wen a gat is plugged in either, no change in the hum nothin.

How can i fix this? please help

didnt work as in only a small hum, sub is old and probably broken
Grounding/wiring issue, I'm guessing. Your safest bet is to take it to your local shop.
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