ok just getting started with rew and i'm having a few problems. first my equipment-receiver denon 988, amp adcom 5503, speakers polk rt55i, computer gateway desktop, soundcard creative sound blaster x-fi xtreme gamer, rs digital spl meter. i've hooked everything up and calibrated my sound card and everything looked good. i was attempting to calibrate my spl meter and my input was low(the vu meter on the right). both my playback and recording levels are at 100% so started to increase receiver volume to increase input. when i had good input and stopped the signal i had a high pitched squeal from my right speaker. i had to turn the volume down and now i have low input. what do i need to do to fix this. i hate to sound like such a moron but everything i've tried hasn't worked. thanks in advance for your help.