Inter-m powered mixer came in with hum and not much else going for it.. After a inspection of front preamplifier circuits plus power amplifier stages.. The following was uncovered.. Shorted output stage with many output devices shorted on one channel, Loose front controls that will need repalced. This will point to faulty speaker cable connection thus short circuiting one channel. As for loose front pots this would be due to being dropped on it's front!