Originally Posted by notnyt
at 7hz and very high db, all I can hear are my doors flapping in the frames, can't hear the fundamental. I can barely even feel the pressure at that level.
Here's the thing; you say you didn't detect it, but your doors sure did.
I ran many tests years ago, but I never used single frequency steady state sine waves. Since the goal is to play back what's on the disc, I played back what was on the discs. I used various filters to roll the playback content off at various points, looking for differences in the experience. I then asked various people to do the same, not telling them that there was any difference, just asking them if they noticed any difference.
As time went on, movies became available to test this question of what I, he or she can detect. After a number of years, a pattern emerged. Now, anyone is free to argue against the pattern that emerges, but I find that to be an arrogant approach when it comes from people who've never experienced flat-to-3-5 Hz playback. I've also found that virtually everyone who posts the whole "who needs it, you can't hear it anyway and it's on the disc by mistake..." crap have never even been near a full BW system.
There is also the point that full BW playback is a relatively extremely new and rare human experience. I'm positively sure, for example, that the first listeners of a hi-fi stereo recording of a live symphonic performance would not have been great sources to report what they heard from a single listen. As with any such new experience (and especially ULF), more information is perceived at each listening session until the listener is completely acclimated to the experience.
Would someone ask a listener to judge a hi-fi stereo playback of a symphonic performance by playing a single sine wave in stereo?
Here's about the most difficult scene to accurately reproduce in cinema soundtrack history, IMO.
Zooming in on a piece of that scene, here's my best shot a reproduction at the seats:
Here's the same presentation to the same seat from a known 20 Hz tuned ported sub:
First, the difference between the 20 Hz ported sub (which is 1/2 to a full octave lower than the typical pro sound ported box affords) and my system is night and day with 100% agreement from anyone who has ever taken part in the listening sessions.
So, would there be a noticeable difference if the system is filtered at 10 Hz? At 7 Hz? At 5 Hz? Who cares, is my response. The point is to have full BW capability, after which you can bump it, filter it, tilt it or whatever floats you boat.
I've just never seen the merit in arguing that one should design or purchase his system based on his own pre-conceived notions regarding what a human is capable of from the design/production side to the listener side, much less coming into a large forum and telling others why they should do the same.