Sunset Center, Carmel, California

Current Hall Layout (October 2000)

Case 3. Multiple sources (#1 through #5) located across the stage. Listener #1 on the left side of the hall half-way back; Listener #2 near the left rear corner; Listener #3 at the center of the hall.

Figure 1. Parametric view of hall and stage; red lines from “1”, “2”, “3”, “4”, “5” are the sound sources. Listeners #1, #2, and #3 are shown in blue.

Figure 2. Plan view of hall and stage; red lines from “1”, “2”, “3”, “4”, “5” are the sound sources. Listeners #1, #2, and #3 are shown in blue.

Figure 3. Early Decay Time (EDT) throughout the hall for source “1” to “5 Typical Decay times between 0.75 and 1.3 seconds are shorter than desired indicating the hall is “dry”. This corresponds with reports from performers and audience..

Figure 4. Reverberation Time (T30) of 1.4 to 2.0 seconds is less than the optimal range of 1.8 to 2.2 seconds. T30 is longer than EDT due to sound captured in a small reverberation chamber above the performers (above the shell and behind the proscenium)..

Listener #1 (Left Side of Hall)

Figure 5a. Reflectogram (no direct sound; delay ~0.10 sec) Figure 5b. Sound Rose

Listener #2 (Left Side, Rear of Hall)

Figure 6a. Reflectogram (direct sound; delay ~0.11sec) Figure 6b. Sound Rose

Listener #3 (Center of Hall)

Figure 7a. Reflectogram Figure 7b. Sound Rose

Note the significant improvement over Cases 1 & 2

Figure 8. Sound Roses in Figures 5b, 6b, and 7b, suggest that the Lateral Fractions (LF) for this design are poor. Here we see poor LF for the rear half of the hall. This means there is little sense of envelopment there. The result is better with a plaster ceiling, but in the Renovated Hall Layout A the result is worse. A surrounding set of speakers planned for the Renovated Hall will improve this result greatly.