Most hifi speakers and headphones are measured very modestly - almost all good headphones and speakers will produce notes down to 20hz but because of sometimes significant bass roll-off, the companies chose to slap on a higher number to the final tech-specs.
One company that regularly doesn't practice this for example is Sony, which will often happily put something seemingly outrageous like 5-35,000Hz as a frequency response for a relatively cheap bit of kit with significant roll off on both ends - but the fact is, it was able to produce those notes in a real test environment.
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Are you suggesting if a person is listenting to music with a lot of bass guitar, for example, that it makes more sense to leave off a good chunk of the music from being reproduced, or that it's not necessary? Can't agree with that.
How often does a bass guitarist actually play the bottom E? I'd hardly call that a "good chunk of the music" - the low E on a bass is 41Hz, and most speakers can play that at audible volumes, in relative balance with the rest of the sound.
The problem with sub-woofers is that they are extremely dependant on the environment. They sound totally different depending on the room they're in, the location of the sub in the room and YOUR location in the room.
Also they can easily dominate the entire sound which isn't true to reality. Human ears naturally perceive lower notes as being LOWER VOLUMES even when they are in fact the same volume as higher notes.
If the thread was about dubstep or electronic music, I'd be saying "yeah man, go for it!" but since classical came up, I just can't agree.
(and to answer the previous purile question, I have heard of a cello - I've been playing and performing in orchestras, esembles, quartets, choirs, and bands for about 18 years (playing violin, viola, guitar, bass guitar and voice); which is about double the time I've been into hifi gear)