Table A1
Dimensions of two acoustically regular resonators with different first impedance peak and theoretical global cutoff frequencies. Both resonators have an apex angle θ = 0.028 rad and input radius a in = 6.25 mm. The distance from the input to the nth hole is denoted w n = r n − x 1, where x 1 is determined from the the apex angle and input radius.
Resonator 1: f
1 = 177 Hz,  = 750 Hz |
||||
|---|---|---|---|---|
| Hole n | w n (mm) | a n (mm) | b n (mm) | h n (mm) |
| 1 | 712.9 | 26.2 | 10.5 | 13.2 |
| 2 | 744.5 | 27.1 | 12.3 | 15.4 |
| 3 | 779.4 | 28.1 | 14.4 | 17.0 |
| 4 | 818.0 | 29.2 | 16.5 | 17.9 |
| 5 | 860.6 | 30.4 | 18.9 | 18.0 |
| 6 | 907.7 | 31.7 | 21.5 | 17.4 |
| 7 | 959.7 | 33.1 | 24.3 | 15.8 |
| 8 | 1017.3 | 34.7 | 27.4 | 13.2 |
| 9 | 1080.9 | 36.5 | 30.8 | 9.6 |
| 10 | 1151.2 | 38.5 | 34.6 | 4.8 |
| end | 1188.0 | 395.2 | – | – |
Resonator 2: f 1 = 304 Hz,  = 1000 Hz |
||||
| 1 | 355.7 | 15.6 | 6.2 | 14.9 |
| 2 | 376.7 | 16.2 | 7.2 | 16.3 |
| 3 | 400.0 | 16.8 | 8.2 | 17.2 |
| 4 | 425.7 | 17.5 | 9.3 | 17.8 |
| 5 | 454.1 | 18.3 | 10.6 | 17.8 |
| 6 | 485.5 | 19.1 | 11.9 | 17.4 |
| 7 | 520.3 | 20.1 | 13.4 | 16.4 |
| 8 | 558.6 | 21.1 | 15.0 | 14.8 |
| 9 | 601.0 | 22.2 | 16.8 | 12.7 |
| 10 | 647.9 | 23.5 | 18.8 | 9.9 |
| end | 672.5 | 24.2 | – | – |
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