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So again, I havenot calibrated the SPL, as the friend with whom I share equipment owns the SPL and isn't around right now to borrow from, but the shapes of the curves are still valid, aren't they?
How's this impulse response look?
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When you say you haven't calibrated the SPL, I assume you mean that since you're using an ECM8000, you don't have a means to establish a known SPL level of 75dBSPL at the listening position, and as such can't match the REW SPL meter to that know level? Not a big deal as long as you feel that your level set at the listening position for taking measures is reasonable and then you set the REW to 75dB anyway to make REW believe it's calibrated.
I also assume you did a proper soundcard calibration and stored that file in REW for use and that you downloaded and stored the ECM8000 cal file from the site into REW....
Anyway, the impulse looks fine and so does the measurement.
You have a few low frequency peaks as you've already determined. You could address the one at ~40Hz with EQ or placement and the other two could helped perhaps with placement. You might try the phase control on the sub to see if it's causing the problem at ~100Hz.
The waterfall looks quite good in fact. You can see the likely room mode ringing out at ~40Hz.
Forget about using the digital out while running REW. There is no way to loop back to create a soundcard cal file. Use analog only.
Yeah, we have reports of quite a few member with Vista problems. I guess it takes a bit of messing around..
brucek