lets just say demoing two subs the yamaha sounded worse then the sony, and the sony was pretty bad, sure its really "loud" and will shake your room, but has BAD accuracy and is really unnatural sounding, the tuning frequencies of the port overpower everything else. ive never heard a yamaha sub i liked. as far as the dayton goes, ive never heard it, all i know is i was considering one at one point in time because as everyone on audioholics knows or should know by now im always on a tight budget and it had a nice price but almost all the internet reviews i read people complained about bad boomy and "boxy" sounding bass and that they usually werent put together real well. i personally like polks subs, but i also know someone somewhere is going to hit me over the head with a pipe wrench for saying that, but who cares, i like them still.