I actually had time to listen to the full album before my friend came over. Wow, talk about extended listening; after listening to Rumours, I also ended up watched two movies including other audio samples from other 5.1 or Quad mixes as demo material.
Now about the Rumours DVD-A, I felt the first song had a bit too much mid upper bass, so it made the audio sound muddy, but most if not the rest of the songs on the album sounded correct i.e. the bass was utilized much better in the lower region of those lower frequencies...an area where my two subs work all too well!
In my case, I think the 5.1 mix would sound even better if I turned down the subs a bit. Doing so would give the appearance of increased upper frequencies to give much more impact with the rhythm section (drums) and vocals. Since there are no standards of how much bass a sound engineer puts onto the disc from the original recordings, we are at the mercy of having to adjust tone controls every now and then. Personally I just leave them alone, so the audio simply is what it is. Actually I have no tone controls, however if I wish; I could go into the menu system and start adjusting the settings, but I'm just not going to start messing around in there.
Something that's been bugging me a bit with my system. Mine is set up for 7.1 That's a good thing as it can also do 5.1, but when my system was calibrated, the receiver was set to map out 5.1 to 7.1. What I've noticed is when I originally mapped out 5.1 to play as 5.1, any rear sounds going from right to left start all the way from the very rear right and end all the way to the very rear left. When the 5.1 audio is mapped out to 7.1, the same sound will still appears to start from the rear right, but because where I'm sitting, instead of the sound ending at the very rear left, it seems to end just a little bit to the rear left of me, not all the way to the extreme rear left. I'm starting to think this is because I'm still hearing the audio from the left BACK speaker as apposed to the left SURROUND speaker. The surrounds are on the very edges of the side walls behind me, and the BACK speakers are further behind, but placed a little bit closer together.
Attached is a image to help describe what I'm talking about.
Not that this is important, but if you were wondering at least with real 7.1 content, the surrounds and rears are independent of each other. I'm sure it's just a setting in the receiver, but what I'm worried about is if I switch it, if it might change mess with the volume level. I would think or at least hope it would stay the same, but I'm going to have to do some testing to make sure.
"Oh Daddy" didn't have that huge room effect I remember from the first time I played it some 15 years ago. However the differences could be many things such as the 5.1 being mapped out to 7.1, or it could be how the audio levels are currently adjusted now when compared to how it was set up with my older speakers. If I remember correctly, I may have been sitting on a different couch at the same spot where the back of the couch was not nearly as high as the back of my current couch. I'm not that tall of a person, so when I sit up really straight and lift myself up a little bit, it does make it easier to hear the rears, but it's not a position I would normally be at when listening for a extended period of time. Yea I know levels can be raised or lowered, but for the most part it does seem fine to me. I think it depends on the mix. Sometimes I really don't hear much from behind, but there is stuff going on back there, and other times it's very noticeable and plays well with the front speakers.
In any case, my experience is the same as others who have written here when it comes to the extra bits of music mixed in that is not on the regular stereo mix. And sometimes I've noticed (as others had stated) it seems like I'm hearing either a different take, or that the levels at which the separate tracks are being reproduced can give the appearance of a whole other feeling even if we are in fact listening to the same take. Above all, that's whats really different to me about this 5.1 mix; it's almost like I'm listening to a completely different album unlike other well known recordings that have also been remixed to 5.1. Take the Yes album "Close to the Edge" remixed by Steven Wilson. It's spectacular, and yet it's a whole new experience even though I can clearly hear I'm listening to the same same recording I've been hearing over all these these years.
With the Rumours 5.1 mix, I can say what does seem different to me (when compared to other 5.1 mixes) is it does not sound as solid to me as other surround mixes. In my view, that might be the better way of putting it when I say that it sounds like a different take when in fact it may be the same take.