Open Access
Table 1
Calibrated absorption coefficients and characteristic depth by octave band center frequency (Hz) for surfaces in the Thomaskirche GA model.
| Surface | 125 | 250 | 500 | 1000 | 2000 | 4000 | Characteristic depth (m) |
|---|---|---|---|---|---|---|---|
| Empty pews | 0.03 | 0.08 | 0.08 | 0.07 | 0.11 | 0.13 | § |
| Organ pipes | 0.35 | 0.35 | 0.20 | 0.20 | 0.30 | 0.25 | § |
| Sandstone | 0.05 | 0.05 | 0.04 | 0.05 | 0.06 | 0.09 | 0.05 |
| Complex wood surfaces | 0.12 | 0.19 | 0.08 | 0.07 | 0.05 | 0.04 | 0.5 |
| Smooth wood surfaces | 0.12 | 0.19 | 0.08 | 0.07 | 0.05 | 0.04 | 0.02 |
| Tile floor | 0.03 | 0.02 | 0.02 | 0.02 | 0.03 | 0.03 | 0.1 |
| Gallery floor | 0.15 | 0.15 | 0.15 | 0.20 | 0.25 | 0.05 | 0.1 |
| Glass windows | 0.18 | 0.07 | 0.05 | 0.03 | 0.02 | 0.02 | 0.05 |
| Painted plaster ceiling | 0.08 | 0.10 | 0.13 | 0.09 | 0.12 | 0.18 | 0.1 |
| Pillars | 0.11 | 0.12 | 0.05 | 0.04 | 0.04 | 0.06 | 0.02 |
| Plaster walls | 0.09 | 0.11 | 0.05 | 0.04 | 0.04 | 0.04 | 0 |
| Complex walls | 0.09 | 0.11 | 0.05 | 0.04 | 0.04 | 0.04 | 1.0 |
| Chancel walls (primarily plaster) | 0.14 | 0.07 | 0.02 | 0.02 | 0.01 | 0.06 | 0.1 |
| Portal walls (primarily plaster) | 0.14 | 0.07 | 0.02 | 0.02 | 0.01 | 0.06 | 0.05 |
| West wall around organ | 0.11 | 0.20 | 0.18 | 0.13 | 0.30 | 0.25 | 0.1 |
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