5:1 Analogue Audio Output

[denzil]

Confusion reigns not only with me but with many sales reps and even Sony help desk. I want to go out from a BluRay player which of course will have on-board Dolby Digital Plus, DolbyTrueHD and DTS HD processors. From the 5:1 analogue output I'll go into my non HDMI but excellent Denon receiver. Same as I do for SACD. So: What is the 5:! analogue out? Toshiba (HD) tell me it is full true uncompressed best possible audio same as would be delivered by the HDMI source. Sony tell me it is not but just a modest version of the older Dolby Digital. They tell me the internal DA converters are not good enough to produce top sound via the analogue path. Yet their specs sheets say they have multiple DA converters on board.
I really don't believe they know their product. Does anybody on the forum understand the truth. Can 5:! analogue output from any manufacturers box give me the proper lossless Tru HD sound? or is it a diminished form of compromise?
I'm new to BlueRay having just swung from HD. I have not yet decided on brand or model. Of course I'd want to go with the best picture result but I'd be very influenced by the brand and model that could resolve my sound conundrum. Does it vary between manufacturers? Doe anybody really know. I thank you
Denzil