A fare more resolving/lower resonance option, with higher output ability and over all better response, would be to use the Yamaha receivers internal crossover, set main speakers to small, crossover to 80Hz, and use a pair of Behringer B2030P 2 way speakers on stands plus 2 x 10" Dayton powered subwoofers. Each sub is to be placed within 3-4' of each main speaker. This is a requirement for music sound quality as if you seperate the drivers much father than 1/2 wavelength from each other, related to crossover point, the sound source no longer acts like an ideal single emitter. With a single sub placed one side of room, there is no way to get this integration ideal on both channels, but two subs will allow it. The B2030P will have far less resonance than the other speakers you are thinking of, and it's off axis response will be far superior; an important qualification of sound quality. Don't let the low price of the Behringers fool you. I have measured/analyzed these in depth and coorelated the measurements to the relevant perceptual research. There is no other speaker for that price that can compare to the Behringers. The only thing the AV123 option is going to benefit over the Behringers is cosmetics. They Behringers are plain Jane utility speakers(pro audio monitors). No pretty paint job or beautiful veneer work.
-Chris