Subwoofer Decision

Some of the flying bits were well done, but I guess you missed a few points…the empty rattling seat has everything to do with Imax subs as it was an Imax theater hewing to Imax design parameters. The sudden eruption of seat rattling bass tones is more of a distraction than sounding anything like reality, unless bombs explode in your pants from time to time (!). Disconnected bass tone elsewhere during the show isn't part of something other than an Imax theater experience. Movie sound is sort of a joke generally, designed to appeal to people who like bad popcorn and don't mind "sub" standard sound.

I saw "Dunkirk" at an Imax theater when it first came out and the empty seat next to me rattled (amusingly) with the strangely staged bass under the seats…I've always thought Imax visuals are amazing, and Imax sound shamefully bad. 

The "slow' vs "fast" issue regarding subs is especially strange and inaccurate. Bass note "hangover" is generally the room continuing to resonate from low tones (unless damped by rugs, extreme cobweb infestation, bad furniture, or your fat cousin Bob) which is what low tones do, and it should be noted that 15s or 12s or 10s or 8s all respond to bass amp commands similarly (although I like the REL main amp derived method), and when those low notes wind up at your ears it's not due to "speed" at launch as that's just a lazy non technical comprehension catch all.

It seems like a lot of fuss over what is pretty simple if your room is relatively controllable (if you don't live in an empty shipping container or a large desert tent)…I use 2 older REL subs (Q150e and Q108II) and no DSP, and they are extremely easy to tune to the room…just move them around and tweak the levels (the 108 is downward firing and right behind my left main in a corner created by a gas fireplace, and the more powerful 150 front firing is near the right wall and can be moved around easily…unobstructed and pointed at the sweet spot). Simply use the level settings and "crossover" (my mains only go to 58hz, so that's my starting point to tweak them) pots carefully and you're in there…these RELs cost around 200 bucks each used, and are utterly great things. Also, I think "lowfreqguy" initially simply misstated the 31HZ E thing as he later mentions the "low B" on a bass which IS 31hz…I say restore his points and declare the penalty voided.