Receiver's Audio and HD Audio performance

[Srficat]

It is not looked very odd that all the new Receivers form the major companies (Denon, Pioneer, Yamaha, Onkio) that support HD audio, have a very poor audio output performance? (In comparison)

If I looked at the audio quality as precision in db numbers, I can say that:

The CD quality (Linearity = how much is direct line. Also quoted as THD) = -96db
In S/N the best machine can give you more of -100db

The DVD must have better performance -24bit 96KHz sampling rate, (DD DTS) but it compressed – I don't know how much?

On BD we have master quality it must be like SACD ~ -115DB. You can't get better performance because we are near the physical limit.

All the generic receivers has performance not better then THD=0.05%

It is = -66db – so we try to get -110db precise Audio with -66db output stage.
What do you think about it?