Well, I'm finally "done". The last steps were to complete the many aesthetic details and especially to do some final acoustic treatment and tuning. I found that there was still a fair amount of reflections off the side walls, whcih was somewhat expected. I've added 4 panels, made of a pair of 705 and 703 fiberglass in each panel. The panels can be attached to the walls to reduce the reflections and add more absorption, but can also be free standing. I can remove the panels from the wall and use them to create a deader space around my recording area if I want.
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How's the sound? Here are some sound samples, comparing what I started with to the final result:
| TLM103 18 inches from guitar | Untreated garage | Final room |
| Berhinger omni mic 7 feet away | Untreated garage | Final room |
| Pair of KM184s | I didn't dare try | Final room |
All samples were recording in roughly the same spot, same guitar (a Ryan Mission grand Concert) with the same microphone placement. The recordings are dry and unprocessed.
ETF Measurements
The ETF measurements are interesting. Here is the Energy-Time-Curve graphs for the original room, (black), and the final treated room (red), as measured from the mix position. Clearly I'm soaking up a lot more energy now, than in the untreated room.
Here's the final reverberation time, RT60 plot, measured at the mix position. The room is a bit deader than I had planned, but it seems to sound very good.
The Frequency Response graphs seem to indicate that the response is a bit flatter than when I started.
I also measured the frequency response at a typical recording spot, with the speaker where my guitar might be. The following graph shows the 1/3 and 1/12 octave frequency response.
The room modes as measured from the recording position:
time:
A waterfall plot of the recording position shows the low frequency response vs the reverberation
