Why are you doing this? The standard method is to feed the AUX or CD input of the AVR from your soundcard line-out, and use the AVR's volume control to set the 75dBSPL at the listening position. The AVR allows you to engage the bass management crossover you would normally use. That way the sub will output the crossed signal that you regularly listen to.into the BFD, bypassing the AVR
Yeah, most AVR's have a switch to shut off the mains or switch to an empty set of B terminals, but if not, you just have to disconnect them. It's only the mains you need to remove since REW is to be used with the AVR in stereo, all your other surround and center speakers can remain hooked up.My reasoning was to defeat the main speakers so I could graph just the sub.
