I'm affraid that if they're old AVR's and don't have HDMI connectors...you won't be able to decode TrueHD or DTS HD encoded on BluRay :yes:
Another option could be that your PS3 decode the audio and send it to AVR ... but you'll need the multichannel input/output on AVR and PS3, Do you know if it has them???
Another option could be that your PS3 decode the audio and send it to AVR ... but you'll need the multichannel input/output on AVR and PS3, Do you know if it has them???