[quote name='Phil Starr' timestamp='1480926441' post='3188016']
It's hard to say without more information. It squeals when turned up. Does it do this when there is no signal which would indicate damage to the amp inside, or when you are playing music(not bass) through it. Does it play music when you have it turned down but distorts when you turn up? That would indicate the amp is probably working OK but something mechanical has gone wrong with the speaker.
[/quote]Well I'm not sure about music as my Macs charger has broken so no Mac. It will squeeling when bass is plugged in obviously. I can't say for any other source. I know of a guy who fixes guitar amp,s etc. I wonder if could have a look at it