So, I finally got the chance to play with REW and I must say that it's quite astonishing, what it's capabilities are.
My system is pretty primitive. I've had it since I was 17. I'm now 27.
It's an old JBL home theater system (JCS1). I simply use it as a 2-channel system. The original speakers are long gone. I still run the original subwoofer (ARCSUB10) that came with the receiver. The receiver has a Pre-Out/Pre-In, which I have wired to an Alesis M-EQ 230 that I use for correction.
For Reference
JSR635

Infinity US-1

Alesis M-EQ 230
I only messed with the Infiniti US-1s. Thus, all graphs are only of the US-1s.
Here's what the US-1 looked like before. This is with the EQ bypassed and the receiver's bass and treble set to zero.
This is after a quick 20min correction session.
I'm going to go over everything again today, as I was just messing around with REW and was getting a feel for the software (which, there's still way more I need to learn). Additionally, as I was putting my meter away, I realized it was set to A-weighting. Oops. I then, threw my Focal calibration cd in and sure enough...it sounded like poo. haha.
Here's an overlay of the before and after.
So, as previously noted, I'm redoing it today with the meter properly weighted.
Though it's been decent for the last 10 years and having the EQ makes it waaaay more bearable, I really need to upgrade my system. Recommendations are extremely welcome, as I do not claim to know anything about current home audio offerings. I only want a 2.1 system that's comparable in size, that I can utilize external correction on, such as I currently have. (Although a parameteric EQ has been recommended to me.)
Thusfar, REW is phenomenal and I haven't even begun to utilize everything it an do.