This is exactly why I like all of my old metal albums more than my new ones. Because I can crank them up and they just get better and better. A lot of the new stuff I've got just gets irritating at higher volumes. So I know exactly what you mean.
The best sounding mixes that I have done happened when I didn't try to get it as loud as I could, and I was just conservative with everything. Kept the guitar tone kinda soft in the high end, kept the O'heads in check, and didn't overdo the kick, stuff like that. Just like Chessrock was saying. It didn't have the same punch or sparkle at low volumes, but cranked up it sounded great. That's the way I listen anyway so that's important to me. I also monitor at pretty loud volumes sometimes because I like to hear what the really cranked guitar tone sounds like. I also get much better results when I don't need to EQ everything too much. If I can get a smooth and fat guitar tone with no or almost no EQ it just sounds so much sweeter to my ears at loud volumes. I sort of find that to be true with most everything in the mix.
Sometimes I've listened to a song right after tracking and just totally dug it. Cranked it up and it sounded killer. Then I've gotten excited about it and flew in there and tweaked everything to get it big and punchy, get the guitars nice and agressive, get the overheads really sweet, etc, etc. Then I go back and really listen to it again and I don't have the same feeling that I started with.....like, shit I just ruined it. Honestly I think that sweet sound comes from good tracking and minimal processing. And also knowing when to say when with all of the loudness. I know everybody says that all the time around here, but I'll say it too because I've learned that myself.
Zed, I think you're into metal if I'm remembering other posts from you....I'm not sure.
Anyway, I've got two prime example albums that I play for people to illustrate this point. "Ashes of the Wake" by Lamb of God, and "Blessed Are the Sick" by Morbid Angel. "Ashes of the Wake" will rip your head off at low volumes, and everything in the mix is just razor sharp and powerful. Everybody seems to love that production as well. "Blessed" sounds almost muffled in comparison at low volumes. The guitar tone seems a little soft, the kick is not real big or super punchy. But when you crank up "Ashes" it almost sounds distorted. In fact it will distort pretty easily on alot of stereo systems. There is just too much of everything. "Blessed" just comes into it's own when you get it cranked up. There are no offending frequencies anywhere (maybe the vocals are a little too loud), there is no grating high end in the guitars, the kick is not distorting anything or interupting the clarity of the rest of the mix. It's absolute bliss for a metalhead like me! Anyway, sometimes I need to listen to an album like that at the full range of volumes to get a good feel for how that sort of mix works and how it sounds on my monitors. If I could just convince everybody I work with that that mix sounds better.....I'd be happy, lol.
Perhaps this is a useless comparison, as I'm not sure how many people around here listen to old school Morbid Angel...haha.