Oops. Me bad. Teach me to research before opening the trap. Oh well.
Ummm....Bass players are really in trouble with me since I always apply a High Pass filter while mastering set at around 45-50Hz with a 12db slope.....

.
But, I still stand behind where I will roll out freq's on a guitar. But, the freq's all the way up to past 12KHz are still majorly important on a guitar.
So, roll out bass freq's, keep the higher stuff.
RE. I agree mostly. Knowing ones equipment is really important. Getting a mostly natural sound is important (when the person has a sound that actually sounds good without any applied eq or anything, a rarity with some artists...

). And maintnance.
I think the point I was trying to make is that books tend to deal with specs almost exclusively. I suppose you could go about engineering based upon specs (there is a local engineer that does this, obviously, his stuff sounds awefull) and I suppose that when it comes right down to it, once you have placed the mics, you did so in a way that worked favorably with the deficiencies of the electronics involved. But, actually paying attention to what you are hearing is THE most important thing about getting good sound to tape. Knowing your monitors and your control room and just as important too. These books never tell you how to know when you actually have a sound that is good.....

This is something you cannot teach, and only experience will pay off. So, I suppose you could read a lot, and never DO anything, and KNOW a lot about the electronics and specs of recording gear, or you COULD actually RECORD and finish projects, then compare results, then TRY new things, etc.....I suppose my point is that the DOING is more important then the KNOWING. We all have to deal with what we have, which may be far from the specs of that equipment. The idea is to work around it, and only experience benefits results.
How many times have you heard the hotshot right out of recording school who can't make anything sound good on tape? I have heard a few. They know LOTS about recording, but don't know the REAL tricks. Usually, there excuse is that they didn't have NEVE pre's with Nuemann mics, and an SSL with GML comp's, and
Lexicon PCM 90's, etc.....Or, they only had 1 day to record and mix the song, etc.....Of course, most of us can get great results in one day using far lesser gear. If we HAD that better gear, or product would benefit that much more from it.
Anyway......starting to ramble....
Ed