REW again

One thing for any sub is that your room will have an effect on low-frequency sounds. To compensate for this, some high-end receivers can send and 'hear' sounds and do some amount of equalization.

None of them can approach the Room Equalization Wizard which is used in conjunction with a PC which plays a variety of sounds, sweeps, etc. Hook the PC output to the input of your sound system, and hook up a soundmeter to the line input. With the right cables, it can also program something like the BFD (DSP1124) with multiple filters to tune it right to your room.

As it is, I rebuilding my shuttle to do the work (it has a nice built-in soundcard), though you'd think I would use the HTPC. The HTPC is being used as the girl's PC for the moment mostly because software for HTPC is abysmal.