Glad you found the settings that work for you in your unique room. Agree we need to see pictures your room sounds cool. I have a pair of SVS SB1000 Pros. My 2 preamp sub outs are also fixed with no adjustments available so like you I have the crossovers setting on the SVS app for each sub set to “off”. It sounds great. The one thing I will adjust is the sub volume as needed on the app depending on the music I’m listening to. If the bass starts to overwhelm I’ll turn it down a few dbs or occasionally up. Usually have them set to -12 db. As instructed in the SVS manual.
SVS SUB BETTER WITH LOW PASS FILTER OFF
After endless tweaking and experimentation, I have concluded beyond a shadow of a doubt, my system sounds profoundly better by turning OFF the SVS "low pass filter"! My amp has a sub out with a filter option set at 80 db's. Like all good audiophiles I carefully followed instructions, searched google to tweak all settings. I tried all variables in frequency. Until one fateful day, for no special reason, I turned it OFF. "WAIT", I said to myself. This sounds better. "Can't be!" "It must be boomy, or bloated, or congested .....or something bad. NO, it wasn't. It not only sounded more cohesive but the "hole" in the sound stage was gone. (I had a sense there was a perceptible hole in the musical picture which kept vaguely appearing which destroyed the whole overall enjoyment. I'm interested if anyone else has tried this heretical approach?