Sprite I'm sure some of the others will jump in on your question as I've never owned Yamaha. I know some people have had issues with some of Yamaha's higher end AVR's not being able to drive the 4ohm 80ti's. They normally overheat and go into protection mode and shut down.

I would also give some consideration to the m60's, they are great and fill my 30' x 30' room with no problem..



M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85