Hello, I have an Autosound 102 test CD that has sine wave test signals that start at 10Hz and goes on up to 90Hz in 1Hz increments. .I want to plot my SPL for the sub 80Hz area of my system (of course, I won't plot every Hz . Can someone tell me if its ok to use these sinewave test signals at reference level (0 dB on my rcvr) without damaging my sub? Or, can someone recommend a better frequency test signal CD thatI can use to plot my SPL readings I'll use AVIA to calibrate my system to 85dB (ie, 0 dB) with all my sats (including mains) set to SMALL. Thanks!