Hi. Sorry for the length here. I have the Mirage AVS-500 satellite speaker system along with the Mirage FRX-s8 sub. I'm not sure if there is a "hole" in the frequency spectrum that is output through the speakers, but if there is, I want to know how to minimize or eliminate it. According to Mirage's website, the main, center, and surround speakers have a frequency response of 90Hz-20KHz, +/- 3dB and the sub has a frequency response of 20Hz-100KHz, +/- 3dB (although I wonder if that's a misprint on the sub; I think it's probably 100Hz at the high end and not 100 KHz). It has a low pass filter which I have set all the way to 100Hz and a volume control which is nearly all the way up (about 9 to 9.5 out of 10). I have all of this connected, through low level (?) connections (with a Monster subwoofer cable), to a Yamaha RX-V596 receiver. I have the receiver's speaker setting at "small" and the main LFE control on the receiver at around 6 or 7 (out of 10). The DD and DTS LFE controls on the receiver are set all the way at 10. I do not have any external crossovers to deal with. The room that all of this is in is about 12 by 10. I do have the Avia calibration disc, but I'm not well-versed in using it or an SPL meter for sound calibration. As I said at the outset, my main goal here is to minimize or eliminate any low-frequency "hole" that may be inherent in my system. Please chime in with your expertise. Thanks.