I think Duke (as usual) makes an excellent point. The OP mentioned that he's heard speakers that meet his needs, with the exception of low bass performance. Duke (correctly) notes that low bass performance is - in the world of full/extended range high-end loudspeakers - as much a function of room as it is of speaker. So subwoofers, which offer placement flexibility to suit the room, might be the right answer for the OP.
Duke's four box Swarm subwoofer may be the most flexible solution on the market, but a pair of carefully set-up quality subwoofers will also do wonders in most rooms.
BTW, low 30hz is effectively full-range for music use, IMO. Of the +/- 1500 LPs and app 5000 CDs that I own, maybe a handful ever hit 30hz. Only one (an SACD of a pipe organ performance) has dipped (barely) below 25hz on my RTA (which I leave running full-time these days, partly for this reason). Conversely, the Audyssey set-up sweeps always hit 16 or 20 hz (depending on where I set set my filter) with full out-put at the 75hz set-up level.
I haven't listened to all 6500 ish recordings with the RTA, nor have I stared at it continuously with all the records I have listened to with the RTA engaged. However, I have a pretty large sample under my belt at this point. There may be low level output below 30hz (which wouldn't register on my RTA), but a speaker that offers full range output at 30hz is going to to offer some meaningful output an octave down from there, and that should be more than equate for the task at hand. On that basis, I'd argue that full response in the low 30hz range is effectively full range for 99%+ of available recordings.
Duke's four box Swarm subwoofer may be the most flexible solution on the market, but a pair of carefully set-up quality subwoofers will also do wonders in most rooms.
BTW, low 30hz is effectively full-range for music use, IMO. Of the +/- 1500 LPs and app 5000 CDs that I own, maybe a handful ever hit 30hz. Only one (an SACD of a pipe organ performance) has dipped (barely) below 25hz on my RTA (which I leave running full-time these days, partly for this reason). Conversely, the Audyssey set-up sweeps always hit 16 or 20 hz (depending on where I set set my filter) with full out-put at the 75hz set-up level.
I haven't listened to all 6500 ish recordings with the RTA, nor have I stared at it continuously with all the records I have listened to with the RTA engaged. However, I have a pretty large sample under my belt at this point. There may be low level output below 30hz (which wouldn't register on my RTA), but a speaker that offers full range output at 30hz is going to to offer some meaningful output an octave down from there, and that should be more than equate for the task at hand. On that basis, I'd argue that full response in the low 30hz range is effectively full range for 99%+ of available recordings.