Would I be better off with just doing 4 subs and not using room correction?
Best idea you've had so far.
I've used a few different room correction packages at different times in my life, starting 20+ years ago with Mcintosh and a MX120. It turned out to be one of my favorite 3.X or 5.X systems of all times. The fact still remained that I liked 2 channel sound with a well integrated sub/bass system. 2.2/4.
It's not digitally controlled and 100% analog. 2 main speakers, 2 bass columns and (depending on the room size) 2-8 12" OB servo subs.
I can easily drop in most monitor sections (300hz >) and leave the sub/bass system just as it is. Just adjusting for the center phantom.
I've never liked the result from any room correction software, but I admit I gave up on that well over 15 years ago.
I use some OB tools that Behringer has in a DCX2496, and I use "room treatment" along with Helmholtz adjustable resonators for 180 Hz <.
The resonators are a simple math thing. A normal rectangle room of 3-400sf with 8 - 12 foot lids requires 6-10 resonators.
I get by very well, with a couple of Behringer mics, (nothing too fancy), and narrow down the location of placement for the subs and resonators.
Above 300hz I use simple tone control and LPads that are installed on all the DIY and commercial main speakers I use.
Some of the worst systems I've ever heard used room correction software. Dull, flat, boring systems. Always in untreated rooms.
I also admit I've heard some very nice systems at friends' homes that have used Room Correction along with very expensive gear, and room treatment, that I could actually sit for hours and listen without getting antsy.
I'd try getting some good data on your room (wide high peaks and wide heavy dips) and try simple placement, seated position, seated height, and tinkering with an EQ. PEQ and or GEQ.
Don't spend a nickel until you have some good room measurements (at least from 300hz <) and a plan. I suppose a decent mic could cost you 1-300.00 usd, but certainly don't go overboard. I used Radio Shack SPL meters and mics for years as reference points. The one advantage I have over most people is that I've lived in the same home I built for over 45 years now. If the dog gets behind the speakers/gear table, I know when she does. The floor noise goes up, and it usually takes a whoppin' 5 minutes to find and adjust the cable routing and get rid of the noise.
All my best Regards