I said it in a tech thread
I'm using my quotes from yesterday. This a simplified explanation. before I became a TV eng I was a touring sound eng, then installed audio systems into clubs which morphed into working with sat.
Providers set the level they want and E* just passes it thru. To do what you are wanting would take a comp/limiter (compressor & limiter) that would have to follow the signal. This would also change the entire dynamics of programming that is being sent thru. Some A/V receivers have a limiter built in that can be set but I don't know of any that will completely balance out like you are wanting. Let's see now to add what you are asking for would only add around $500 to what the DVR cost to build so I doubt it is gonna happen.
The following is my statement about highdefjeff:
It's Highdefjeff spouting his incorrect understanding of the problem. I have a .9 meter dish peaked on 129 and it makes no difference in volume levels between SD & HD channels. I at present have a dish 500 peaked on 110 & 119 makes no difference. I'm about to install a .8 meter dish for 118.8/119 and a dish 500 w/single feed adapter for 110. If each feed is peaked on a sat it will be the best signal but above a certain threshold it only makes only a difference for rain fade. It will not affect volume levels of sound or the PQ it just gives you a margin before loss of signal.
Now for a little more detail:
Both Dolby Digital and DTS have wide dynamic range That trys to be as life like as possible. SD audio just doesn't have this: it is compressed to less than half due to the fact it doesn't have bandwidth needed. I'm including here a link to Wikipedia about surround sound in general if you want to read for a while.
Surround sound - Wikipedia, the free encyclopedia
Yes I have a serious surround sound system It is a 7.1 w/ 2 spatial speakers as well ( so it is close to a 9.1 system) I also have a 42" panny 1080 24 p Plasma HDTV.