Hi There, I have been fixing amps & all sorts for years for my friends who run bands etc. I do it in my spare time to help out etc. My occupation is an electronics technician so I know what I'm doing!!
I got a Mackie SRM 450 from a friend who said it was noisy, thinking along the lines of PSU ripple etc said I'd take a look. However, upon powering up, I heard the hum and after about 2 minutes it crapped out.
Putting input in only gave me sound from the tweeter. I checked the connections for the speakers etc and found one measured 6.4 ohms (approx) and the other was open...so it l
