I have the Arendal subwoofer and set the bypass at 10hz -15 hz above the floor of my main floorstander speakers that go down to 35hz. I read somewhere that 10hz above the low was a good place to start. I too switch the low pass 12hz filter off, as that works for me too. Saying that I use very little db gain, about 2.5db to get a very smooth integration. I agree doing it by ear even though I can do it through an app strung in my listening position is not as good as having some form of room correction, but in my case the room, is the room, is the room!
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?