As I mentioned, the rehearsal room we use is a converted garage, with dimensions not ideal for a studio. The ceiling is low, for instance. The air-conditioner, storage cabinets, and so forth also restricted where we could place the drums and amps. Noise insulation was not an issue, but room acoustics was.
The biggest problem was what seemed to be a strong room mode. There was one note that, when I struck it on the guitar, was much louder than the others. If memory serves, it was the E note on the 5th string.
I didn’t know of this forum then and would have asked advice here. I am impressed by the amount of expertice shown by the contributors here and their generosity in providing advice. The good thing though was that I had friends who were into acoustic treatment, and they provided free help.
A friend came over with a device that he plugged into the studio PA system and which then generated and analyzed different types of noise, some white noise, some loud ones. The device confirmed which was the dominant frequency in the room, the frequency that the room tended to resonate with or emphasize. Here is a photo of my friend with the device in the studio, before we applied any acoustic remedies. That was several months ago
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In any case, we went ahead with recommended acoustic treatment, put absorbent panels on the ceilings and some walls. These made a remarkable difference in the room.
I’m just sharing my experience and hope that will benefit others building a home rehearsal studio. I’ll bring MikeP over also, as I am sure he will suggest where we can improve things.
WShad