I have a Denon avr-x4200w receiver powering 2 Klipsch r-28f towers, a Klipsch 450c center channel, a Klipsch r-15sw sub and 2 Klipsch rb-61 ii's rears. When I play music from my iPhone via Bluetooth only the towers and the sub are firing! Any idea's, I think its a setting issue or something...any help would be awesome as I am a newb when it comes to audio setup. Thanks!!!