The only other room I heard anything like this was an impeccably acoustically designed and tweaked out room that also had two huge racks of subs, not a classic distributed array exactly but with 4 on each side stacked 5ft high not all that different either.
Reminds me of the Infinity IRS V speakers which have 6 stacked bass drivers per side. The sound was jaw-droppingly good! Why use 1 subwoofer when you can use 12? Just don’t forget to short them if you aren’t using them when listening to music. Actually, I’m quite sure you can accomplish the same effect as shorting by simply turning on the amplifier but don’t feed it a signal. I get the same effect tapping on the cone and hearing silence by turning on the amplifier as I do with shorting. I wonder what the technical reason is.