Here is a plot of my bass response curve. I used the Snapbug Excel worksheet with the Radio Shack corrections. The blue line plots my response from the listening position, vol. set to 0dB (the automatic reference volume of my Integra receiver--my speakers are calibrated to 75dB (also the recommended setting for my receiver as per its manual). I ran the test tones from my laptop to my receiver via analogue stereo phono plug to rca plug cable, with full output from the laptop volume setting. The sub is a Boston Acoustics PV900. Crossover was set in the receiver at 80hz and the crossover bypass input was used in the sub. Phase was set to 0 degrees and gain was set at about 40% (no numbers on the dial). Edit: Can't find way to post the graph so here are the corrected numbers FREQRAW SPLSPL (comp) 166879.5 1879.587.5 208895.5 229298.5 2597102.0 28101105.0 31.5100103.0 36101103.5 40102104.5 459698.0 509495.5 5691.593.0 6367.569.0 719091.5 8090.592.0 898687.5 1008385.0 1117778.0 12575.576.0 142.565.566.0 16059.559.0 Any suggestions?