[zorax2]

Thanks for clarification on so many things. I didn't realize that cutoff = crossover though it makes sense now.

It appears to me (correct me if I'm wrong) that once I import the house curve (30 5.0 and 80 0.0) into REW that I move it up or down within REW using the "Target" control on the lower right side until it intersects nicely (more peaks than dips) with my measured sub response. I then use the "Find Peaks" and "Assign Filters" to adjust my subs response to follow the house curve. Finally, I export the filters to the BFD and now adjust the volume control (not the trim control on receiver) on my subwoofer to equalize the sound level between speakers.

As far as the soundcard calibration goes - I'm thinking I'm following things to literally. The help guide states: "The default is to use the Right input, but either input can be selected on the SPL Meter panel. Both of the soundcard output channels carry the test signal, one (typically the Right) must be connected to an input channel on your AV processor or to the input of your equaliser." Therefore, when I got to the help page and all of the samples shown showed examples with the left channel I was a bit confused. In the end, I still haven't verified the response of my audio card calibration as when I click on the Left tab and do a sweep I get an inverse copy of what appears to be my MIC calibration file. Nevertheless, I believe the soundcard is accurate and working properly and my results are OK. (Yes I did a loopback - removed the initial subwoofer to line-in and line-out to AV reciever and used a cable to jumper between the RCA plugs on my USB audio card.)

Is the standard sweep more accurate as it picks up the reflected, transient sounds more quickly than the 1/6 octave sweep? Why do many people post the results of the 1/6 octave sweep instead of the standard sweep?

As far as the SPL, the 80 setting works nice with the needle centered. Again, I was following the REW directions more literally using 75 dB. I found that I had no problems with REW setting the input volume once I did this as well. Previously, the input volume would max out until I lowered the SPL level to 60 dB on the sound meter.

Thanks everyone for all of your help. I'm learning a lot and believe I'm on track to figuring all of this out.