I don't know if I should be serious here or what... I really don't know.
but, let me try, what the hell....
If! to take any one of those "three" questions seriously, then they are most definetly not technical. They are actually rather closer to be political or religious than being technical.
But what they really are - these questions are quintessentially moronic
First of all in general there is absolutely no way to give any real answere to such questions in technical terms.
"Where did my high end go?" - is this a technical question? You gotta be kidding.
"why is there so much lower midrange?"
Lower midrange? So much? Where? Doing what? Recording/mixing what?, what equipment? yada yada..... What does it mean "Too much" How much is too much? To get to the bottom of it (the the bottom of the actual specific situation) so, to be able to even guess of some sort of technical answer to a such question you'd have to ask the whole bunch of other question...and even after that you still will have very distorted picture what exactly "too much lower midrange" may "sound" like in that specific mix/situation inside the head! of a person who asked the question. And if you go through the trouble to sort of getting to the bottom of it - the issue may actually turn out to be anything from a simple eq-knob-twist through a specific or very broad philosophical/artistic/what-have-you view/approach.
If somebody say: "I've noticed too much of midrange in my mixes" - I personally have no f*ng idea what it may be like exactly. These are just pretty much empty words. Discussing something like this and pretending that you are having some sort of serious technical conversation, giving serious technical advice and solving something is pretty pathetic. But at least it would be just a making-no-difference blah-blah, nothing more
harmful than that.
But! Advising a guy with a such question to go and visit Auralex Website/Store - would be a real act of
speaking out of your ass. That's what I CALL - irresponsible. (Excuse me, my french'here...
)
but, then, again... OK, let's say you do advise a guy to "Auralex-The-Room", then do
responsibly:
-Don't say you MUST do it. Say you can try it.
-Don't say it will improve your room's acoustics. Say it may. Also say it will definitely change your room's acoustics, and the result actually may suck. And one thing for sure - you will have to take time to
get used to it in case you've already have collected some listening/mixing experience in your current room with your current setup. (btw, May I remind you:
listening/mixing experience is THE REAL and ONLY treasure for any serious music producer! And such experience is strongly tied with equipment/environment. Losing/changing equipemt and/or environment is very close to practically losing the entire mixing/listening experience.)
-Don't say it will help you to make better mixes. Say - in case if all above will work out positively - you will MAYBE have a more productive environment in respect to specifics of your production (such as specific musical genre, taste, whethe the producer produces his/her own material or working on other artist's material, specifics of targeted audience (i.e. music for computer videogames, on-line/mp3s, CD-album, Dance-Club, radio-play, background music etc etc you name it)
**********
>>>>>>>>
-Q: 'why do my mixes sound muddy on other systems?'
-A: thake your 'other systems' out'a mud.
again, that if you REALLY seriously take a such question. And I seriously mean it.
/respects