Our church has a 24 channel, I don't know the model number. It's a couple of months out of warranty and has a bad crackling sound until it warms up for at least half an hour. You can tap or push on the knobs on the right side of the board and get it to crackle even worse. The company that sold it to use and set up the whole system called to see if Berhinger would help out beings that it only gets used two hours a week at max. He was told "sorry we can't help". When he explained that he does lots of buisiness with them and he might need to go else where for equipment they told him Ok, by and hung up! Anyone had the same or better luck with them?