Hifi this is a great thread, which has a lot of life ahead, many more astute observations will be presented before we get to the "bottom" of things. Issues not addressed properly, or at least not fully explored as is being done here. No speaker is exempt from this critical thread, all will be revealed when its all said and done. Hype has no place on this thread. Only educated opinions, and some hunches are OK. But nothing overdone please, those days are bygone. We are entering a new phase of critical apprecaition in speaker voicing. Amps I have no comment, pick and choose as you free will.
Type of music listened to has been mentioned several times, and should be taken into consideration. I'm listening right now to a compliation cd Mississippi Blues, produced by PUTUMAYO WORLD MUSIC, bought it at Whole Foods. Pretty high quality, close to reference quality. I have the vol on my amp at 1/4 and find this to be best offering in this msuic for my system under most music. The bass is there, tight, even though its misssing out in the 20-40 hz's, I'm not sure if I really want the speaker to go lower. At 1.4 volume, the sound carries throughout the entire house and this cathedral room of 40X30 is a comfortable level. So though this MTM design is missing the loweest 20-40hz register, the dual 7's make up for a fuller 40+hz register. IOW those who might have a 3way that grabs the 20-40hz may not offer the fullness I get out of my dual 7's that really give you your money's worth at the 40hz level. Trade offs are a part of all things in audio. That happy median is something each of us has to define individually and do his own research as to what is "the ideal" for him.
I wrote Ty about this issue the other day. He wrote and said the 8 inch would give me a lower botton, say 30hz, but I would sacrifice the fullness offered in the MTM, dual 7's, going to 40, maybe the 7 goes to 35/38hz, I cant reacll the Seas specs. So in this blues cd I will get a better bottom end with the 8, but when i switch back over to my prefered music, classical, I'll be missing oyt in the full orch image of the dyual 7's. IOW I may find the 3 ways with only a single 7 may seem weak compared to the MTM dual 7 inch design. And lastly with the 3 way, the 8 by going to 30hz will offer the fq's I am missing with the 7's, in the double bass, cellos, tubas, timpini. I'd like to experience those low registers from the orch. Ty did say that one design gives up something the other offers.
This comparison can be carried over when comapring one lab to another.
So first thing is to know exactly what fits your needs, and knowing comes by discussing speaker issues on threads like this one. No one speaker fits all.