Originally Posted by cloudbuster
was not aware of that, would that be mostly because of a single tweeter?
So would the room compression translate a little to tactical feel or only headache if is to much?
How you prevent pressure headaches without compromising on tactical feel?
I will try to answer the questions in your second paragraph, but it's a complicated subject. The first (and best) answer is don't worry about it. Unless you are prone to headaches from music/movie listening, this is very unlikely to ever be a problem for you.
The second answer is that room compression, and the tactile bass sensations that most people refer to, are different things. Room compression describes a physical phenomenon where someone is feeling substantial pressure against their ear drums (first) and the head and other parts of the body as the experience is sustained. You can feel those sensations as you go about 8' underwater, or as you are in an airplane that pressurizes at mid and high altitudes.
In a home theater, we will mostly feel those sensations at very
high volume levels, and even then sturdy home construction and a sealed room may be necessary to feel the sensation of compression very strongly. Other tactile sensations, such as chest punch (which is a mid-bass sensation) or tactile ULF (which is like a deep rumbling sensation) can be felt at SPL's well below those necessary to produce room compression. And, they can be felt in rooms which are open to other spaces.
And, it's not as if that room compression phenomenon exactly sneaks up on us. I have felt that sensation to some extent with movies like Batman Versus Superman
, where I was watching at a higher than normal volume level, with a lot of bass boost. I felt my ear drums flutter (quiver) a little and knew to back-off the volume. It wasn't really comfortable anyway, and I never want to damage my hearing.
Chest punch and tactile ULF are sensations I like. Room compression (or airplane compression, for that matter) is not something I personally care for. YMMV! But, if you don't want to experience it, particularly to the extent that you get a headache, it is certainly something you can control. Just back-off the master volume a little. If you would like to learn a little more about the various tactile sensations, and what I believe causes them, Section VII of the Guide in my signature will help to explain them. This is a direct link to that section: