Today i recived my carvin r600 series III amp today to power my avatar b210. It looks great, it feels like a very solid amp. I bought it off of ebay for $400, its in new condition. This is my first head/cab rig, so i wasnt sure what to expect, but its very noisy. Its a 4ohm cab, so the head is running full power. Its has a very loud hum. I set the eq flat. I messed around with the compressor, but that didnt help. I have a 1/4 monster speaker cable connecting the head and cab. If i got a speakron cable, would that do anything? Is it supposed to be humming so loudly? When i turn it up, one of the speakers crackles. Also, it seems that there is no low end. Its very trebley and scratchey.