Oh yeah, almost forgot....
My latest "toy" that came Wednesday is the Dayton Audio DSP-LF Bass contoller from Parts Express. It is like a poor man's MiniDSP EQ. Rather than requiring a UMIK-1 or similar outboard mic along with REW, it uses your Apple iPhone mic and is calibrated to correct for the mic's accuracy. You must use the "Pro" version of the app it uses to utilize the iPhone mic since there is a basic app that does not use the mic. There is not a "Pro" version of the app available for Android users as the mics used are inconsistent and cannot reliably be corrected for, so you would still need a way to measure the room response with software like REW. Using the iPhone mic, the DSP-LF app takes a nearfield response sweep of the sub, then takes a sweep at the listening position then tries to correct so it closely matches the nearfield response. There are 3 EQ curves it can correct to...... Boomy Region, Near Field, and Linear. Each will give a different sound charateristic so you can try all 3 and choose which you prefer.
It's pretty slick. I'm still evaluating but so far it has cleaned up the bass with fantastic speed, timing, impact, and accuracy.
HT - 5.2.2 ATMOS With: Klipsch DS Series In-wall/In-ceiling Speakers|2x Rythmik LV12F|Denon AVR-X3300W|Sony UBP-X800|Sony XBR-85X900F|AppleTV 4K
Music - 2.1: Ascend Acoustics Sierra-2EX|Rythmik 12" Sealed Direct Servo Sub|Adcom GFA-5500 With LX-Elite mod by Musical Concepts|Parasound Halo P5|Cambridge Audio ID100 Digital Dock|Audio by Van Alstine Humdinger