What would cause an amp to all of a sudden start sending a signal at a higher pitch and a faster speed?
The System: Base System Dell PC w/ SFX 5.60 build 24 -> echo gina 24/96 -> a&h wz14:4:2+ --- Amps ---> mackie fr series m1200 -> 2 ev sx300's ---> mackie fr series m800 -> 2 apogee acs-1's ---> DBX 1231 Graphic EQ (functioning as a gate for freq. below 100hz) -> tapco j1400 -> JBL SR4725
Everything has worked just fine. I played an effect that comes through all 5 speakers and it sounded fine. I stopped it, adjusted volumes in SFX, then replayed and the sound was out of sync. After a lot of system testing, the mackie m1200 seems to be sending the signal at a faster rate and at a higher pitch than the others. This literally happened out of know where without anyone touching the amps or system configuration.
Any insight into what is happening would be wonderful. Thanks.