Confused on Lossless Audio need Help !

[rox addict]

Hi, I am looking to get lossless audio but I'm a litle confused. Okay this is the equipment I have and I am just confused on what I need to do:

Sony BDP-300 Blu-Ray
Yamaha 6.1 HTR 5740 Receiver
All Infinity speakers setup for 7.1
Samsung 50" 1080p Plasma

Both the BDP-300 and the Yamaha 5740 are capable of multi-channel so I need to set my BDP-300 to Bitstream and not PCM ? I assume you choose 5.1 Dolby True HD, I think. I have been running my BDP-300 using the optical cable and my Yamaha 5740 receiver decodes the Dolby Digital EX and runs all 7 speakers but I'm reading that is not true uncompressed sound and running via analog outs through the multi-channel is the way to go for best sound. I remember doing this when I had a SACD player and I remember having the same problem with the bass lacking. I do use this receiver as my main music receiver as well and I hope that the bass isuue wont be a problem. Also, I might upgrade to a Blu-Ray player that will decode True HD ( I haven't reached my 30 days yet) as I eventually want to buy a receiver that will do this but for now my receiver is only 2 years old. Can anyone help me out and maybe lead me in the right direction ? Any help is greatly appreciated