what is your budget? how big is your room? so your going to hook the iphone to the receiver I assume? Anyway, all the axiom speakers are very efficient and will use 1 watt to achieve very loud levels from 3ft away (1 meter). Your Sony will be fine.

A speaker that is rated at 90-95dBs 1 watt 1 meter, is pretty loud.

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