sammy1

Hi all
I’ve an audio prob with my 99 Impreza
For some odd reason its just lost its sound output on all speakers
The head units an Alpine and is still reasonably new
Thinking it could be at fault we tried it in another car but it worked fine
On taking it out nothing was lose or disconnected, so now run out of ideas what else to check
Does anyone know if these cars run a factory amp?
Or some sort of relay/junction box the speakers run through?
Cheers for any help
Sam