no, what i meant by that is my personal experience with subs i would rank the L7's the CLOSEST to an spl setup being that they are the probably the loudest that i had the chance to hear. i know its apples to oranges but not quite what i, trying to get into.
point is i know some subs arent to high in the SQ catergory ie: L7 and btl (only thing im comparing is sq here) The L7 isnt really horrible sounding to me so if the btl has the same or better quality then i dont mine. I understand it all depends on the enclosure and everything else but certaint subs have traits before hand...like a q series is sq while bl/btl is considered spl....now on the sound quality side of the spl speakers i was asking if those two (L7&BTL) are close in that sense not in loudness/db's
fyi= considering putting the BTL in a ported 4.5cube box