I have a feeling that you may want to upgrade the Amp. A seperate amp would work best but to get the kind of Sound Pressure your looking for, you'll need a high power/current amplifier. That Sony isn't a bad receiver, but the the power output at 110watts would actually be about 50 clean watts of power while above that, your are distorting terribly considering the loudness your looking for. RF3's are looking like they want 150watts, so, your would require at least a 200watt amp(clean power) or 250w to get the "headroom" you would require to get clean output (reduced distortion for the tweeters) for the RF3's. What I think with the phone is you are having to turn the volume up so much that the amp is "clipping" (distorting) and causing your tweeter stress. A preamp for the phone would porlly fix that...