The "pressurized room" thing actually is the "natural" state of sound and should be respected as a matter of degree of course...the low frequencies you hear as a part of the sort of "room sound" in live music anywhere seems to be the mojo missing from systems lacking a full range. "Pressurized" just sounds dangerous, but unless you get crazy with 18" driver multi thousand watt subs in your converted shipping container listening room, you should be safe.
How to connect a subwoofer into a mono block system
I'm interested in adding a subwoofer into my audio system. I have a new Audible Illusions M3B driving Welborne Labs Laurel Iix ultimate mono block amps and ProAc 50 Signature speakers. I've been confused by material on the web as to how to do this so as to insure that the subwoofer is seeing exactly the same signal that the ProAcs receive. Any recommendations, both as to how to best do this, but also on subwoofer choices?