Yea they will sound a little thin @63hz 24dB/oct if you don’t use any EQ -- they will create plenty of spl at 63hz (about the same as the XXX6.5s).... just they will create so much more spl in the midrange that the lower freq are overshadowed (again without some sort of bass boost... if it is boosted though it will sound normal -- PLENTY of xmax to go arrnd and they are sensitive enough down low that you will still get good SPL out of them.., and the mids will be much more detailed and extended -- not to mention you could rly almost use these as dedicated bass or midbass drivers just fine with an active lowpass -- could rly be used as a small subwoofer about on par with RE RE 8 -- slightly less output though (1-2dB) and in the same box size ported your xmax is limited below the tuning freq a little faster than the RE 8... Rather useful for home audio due to the fact that baffle width can be kept small //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif ).
Going to be using 10 of these -- 8 as mini powered subwoofers in some towers for home audio -- 2 of them as mids with
http://www.madisound.com/neopro5i.html as the tweeter -- if nothing else I'm going to use them -- but they should turn into a rather nice very high end home audio line... along with smaller versions of this setup... Should be able to pull about 94-95dB/w sensitivity out of this setup with nearly full baffle step -- and reasonable power handling to say the least. Realistic levels should be produced with next to no distortion (well considering they ARE 6.5" speakers -- even though there are 8 of them distortion will creep up a little bit at the very bottom... but still very acceptable -- I'd expect them to do about as well as if RE RE 8s were used... considering these are XBL^2 -- and the REs are 8s...) down to about 30hz... where a monster sub //content.invisioncic.com/y282845/emoticons/up2something.gif.dd110ecf3ae4b76050d87598f2f8de7c.gif can take over
But oh so sexy.. nice narrow baffle + bass = a happy family