I'm a newb here, I have had my 8.1 iMac since May last year. I recently purchased a set of Sony Bluetooth Stereo headphones for use with my iPhone which also had issues, but I resolved those. Has anyone experienced bad A2DP audio from they're iMac thats tried it out? It's very distorted playing upper frequency range tones from cymbals and guitars. My iPhone did the same thing, restarting it fixed it, no such luck from the iMac though.