colasblue
pfm Member
Erm, not quite, m/lud. If you have a 'closed box' room then the lowest pressure mode is actually dc. Hence a speaker that can output very low pressure variations may well give sounds in the room at frequencies well below the 'lowest mode' people normally assume can be produced.
In my main listening room (which isn't very big) I could get a fair bit of output down to about 35Hz even with ESL63s! - admittedly having boosted the drive to them at LF by modding the bass lift of a QUAD 34. Main limit was that I wasn't trying to play overall at trouser-flapping levels.
I did say "freely propagate". Pressure mode is different and you can indeed get deep bass, but it takes much higher levels of power to make it happen (the word attenuated) and it's very hard to actually engineer the transition region.
The experts in the field would be the car audio nerds with their arrays of 12 inch woofers in the boot. Of course you only hear the bass escaping from the sealed box when one goes past.