| Mode | Length | Width | Height |
| 1 | 32 | 102 | 93 |
| 2 | 64 | 205 | 186 |
| 3 | 96 | 307 | 279 |
| 4 | 128 | 409 | 371 |
| 5 | 160 | 511 | 464 |
| 6 | 192 | 614 | 557 |
| 7 | 224 | 716 | 650 |
| 8 | 256 | 818 | 743 |
| 9 | 288 | 920 | 836 |
| 10 | 320 | 1023 | 928 |
| 11 | 352 | 1125 | 1021 |
| 12 | 384 | 1227 | 1114 |
| 13 | 416 | 1329 | 1207 |
| 14 | 447 | 1432 | 1300 |
| 15 | 479 | 1534 | 1393 |
| 16 | 511 | 1636 | 1485 |
| 17 | 543 | 1738 | 1578 |
| 18 | 575 | 1841 | 1671 |
| 19 | 607 | 1943 | 1764 |
| 20 | 639 | 2045 | 1857 |
| 21 | 671 | 2148 | 1950 |
| 22 | 703 | 2250 | 2042 |
| 23 | 735 | 2352 | 2135 |
| 24 | 767 | 2454 | 2228 |
| 25 | 799 | 2557 | 2321 |
| 26 | 831 | 2659 | 2414 |
Table 2. Axial resonance modes.Transfer Function
I determined the transfer function of the Sprinter van by first measuring the response of a high-fidelity fullrange loudspeaker in a free-field, then measuring the response of the same loudspeaker placed inside the Sprinter. The difference between the loudspeaker response in a free-field and in the enclosed environment (closed-field) constitutes the vehicle's transfer function. It's important to note that the free-field frequency response of a loudspeaker is difficult to determine accurately, even under ideal laboratory conditions. The equipment used and methods employed were readily available and practical but at best, an estimation.