Yeah, I tried messing with REW sweeps when I went to integrate my new subwoofer - and honestly, I think that I can get better results, quicker, just by trial and error and listening to the bass level. :-) Plus, the timing chirps don't work well with subs. I just remember it being a huge pain in the arse...
I thought that I needed an XLR mic to measure phase with Smaart/Open Sound Meter - I didn't realize that you could do that with a USB mic. I'll have to look into that. Although, at this point, just trial-and-error with time alignment, allpass filters and polarity flipping have got me to where I need to be.... Even the Helix ATM (automatic time alignment) didn't work well for me - would end up with huge dips in the bass response if I used the values it suggested. My time alignment values are "strange" looking, but it sounds great and the measurements looks good, so I'm happy.
Will still check out that Open Sound Meter tool and how to get it working with a USB MIC though - i'm sure it will come in handy in the future.
Here are the measurements that I took yesterday (didn't include subs though). Really happy with this setup right now. I'm constantly messing with the overall tonality of the system, trying to find that "sweet spot" that works well for most music. Originally, I was keeping the treble flat all of the way up to like 18khz, but I've since rolled it off starting at about 12khz and that seems to work really well for me. My "curve" is nothing like any predefined curves I've seen though - I like way more bass and treble - especially while actually driving down the road (as opposed to sitting in the car in my garage). :-) I have a trunk sub and an underseat sub - trunk sub plays from 10hz-55hz and the underseat sub plays from 55hz-80hz, where the midbass takes over. I also like a lot more midbass than most. Between the 6x9's I'm using in the doors, the underseat sub and the trunk sub, I get very "powerful" bass/mid-bass. Using 24dB LR acoustic slopes for everything (using whatever electrical xover type/slope works best for each speaker).