@macg19 No subwoofer crawl or gimmicky software with "special" mics required.
If you’re using a -6dB sub-bass speaker/s they roll off around 40Hz and simply do not output enough subsonic frequency to excite most rooms standing waves. I’m guessing your using one or two satisfactorily right next to your main speakers which are typically located in the rooms null?
Actual subwoofers output a far lower frequency which can excite a rooms standing waves. The subwoofer crawl IS exactly the gimmick that easily demonstrates the reverse locations of most, if not all, the rooms standing waves for subwoofer positioning in relation to the listening position.
A four sub distributed bass array can eliminate a rooms standing waves all together making the crawl moot. Either method does not require a purpose built room.
The ability to process and compensate poorly recorded bass or to simply to kick out the jams with punched up deep bass is really fun audio nonsense. Your happy, we’re happy. Don’t forget the sunscreen.