Randy,
Thanks very much for your feedback and time on the phone. Great information. I'm putting the finishing touches on my room and hope to have the basic conditioning finished within the next two weeks. I'll be using the "checkerboard" method you suggested to get rid of the harmonic tones.
Please be sure the following info that I'm sharing is correct.
The term"soft panel" refers to the method you choose.
I'm using convoluted foam in frames covered with a porous cloth.
There are other types of material you can use but the better absorption it has the better job it will do. (and the more it will cost).
Other options include pro-grade sound blankets, cotton fiber insulation or quiet batt insulation.
For those who are trying to flatten out a music room, expecially for drums, if you clap your hands or tap on the edge of a snare even at moderate volume, you might hear a high pitched quavering note. Very hard to miss and very annoying. This is what Randy says are the harmonics.
My room is small and has parallel walls.
Think about two facing walls, Wall-A and Wall-B:
Randy suggested adding a soft panel starting on Wall-A then leave the opposing section of Wall-B as is.
Now move down the room and add a soft panel on Wall-B, leaving the opposing section on Wall-A as is.
Continue this "checkerboard"pattern. Cover at least 45% of the walls or until it sounds good or you run out of money.
I'm also going to mount a panel on the ceiling over the kit.
Depending on how this works I may add bass traps.
More updates as this moves forward.
Thanks again Randy.
Stevek