Bass- at what frequency does it change from sounding like a string to just a low tone?

Audio rusty: that makes a lot of sense to me. If you were me, where would you have your low pass cross over if your speakers dropped off six at 48?

@waytoomuchstuff IMO the way ATC rolls off the low frequencies is better than the usual way.  They roll off slowly starting at a higher frequency.  This is probably a marketing disadvantage but in most practical situations it's a plus.  A speaker that slowly rolls off the bass has far fewer troubling room bass problems while still being capable of great punch and greater dynamics than a speaker that tried to be flat to 30 or 40hz.  It allows you to place them where they're optimal for the rest of the frequency spectrum and fill in with subwoofers what isn't there.  I've got a pair of custom built 110s I bought used about 10 years ago.  I've had them in in at least 5 locations and they're very easy to just set and forget.  The 3 inch mid doesn't have the beaming issues a larger driver would so the in-room response is good and they don't upset room nodes nearly as much as you might expect.  

My guess is the room has much more to do with making strings sound like just a note than the speaker.  Most rooms have huge peaks and valleys in the deep bass.  I 15db resonance peak will swamp the texture and that peak will be different in every room.  

jon_5912. This is what KEF seems to be doing. My R3 Metas don't have impressive low frequency specs but they seem to take good advantage of room gain.