Wow! Harvey, Little Dog, you guys have given me some great information, and some good points to ponder.
More experimentation is definately needed!
In this room, when I'm just playing the piano, it has a wonderfully soft, warm tone to it. I think that's pretty typical of Boston pianos, unlike say a Yamaha C7 which has a decidedly bright tone.
It's that soft, warm tone I'm trying to capture, and I know the piano is capable of delivering it in that room. The "attack" walls of the piano are acoustically treated with absorbers and diffusers, so I don't think I'm getting any phase anomilies from that.
I usually mic it with the lid in the full up position, lowering the lid to the "short stick" seems to make it worse.
Harvey- I'm constantly amazed at your ability to visualize what's happening, and offer suggestions for improvement. When using the SD's they seem to benefit by allowing a little more air or distance from the source, so I have one mic located about 12"-15" above the harp on the treble side; in keeping with the 3:1 rule, the other mic would then be placed approx. 4' - 5' from the first mic on the bass side, and approx 18" above the harp; in effect placing it at the 1/2 wave length of A2! (Doh!)
With a little more judicial placement, the effect is lessened, but not completely resolved, and the problem does indeed seem to shift in frequency. Does this mean though, that by moving the mics around, I'll just be chasing wave lengths around, in effect trading one wave length's phase cancellation for another? Or, can I phase reverse at the mic pre and resolve it? I guess I'll just have to try it.
I have several mics I want to become proficient with on this piano, because, as you said, different keys can pose different problems for a given mic.
I think I have the TLM's down pretty pat on it and seem to work best in the key of Eb maj. but don't sound quite as nice on something like Dmaj. The SM81's sound VERY musical in this key, except for the afore mentioned problems. (Just to give you an idea of where I'm comming from.)
I still have the RCA 77DX and have only just begun to work with it. You kind of scared me initially, so I make sure that I move VERY slowly with it, and work gingerly around it. But the initial results I have had with it are astonishing!
Thak you so much for taking the time to educate me in this matter.
[SIZE=3][COLOR=RoyalBlue][FONT=Garamond][b][i]"Nobody digs ya music, butcha self"[/i][/FONT][/COLOR][/b][/SIZE]