Based on the interior dimensions of the Sprinter van, the internal volume was determined to be 16.83m3 (594.4ft3), very close to my initial goal of about 600ft3, favorable for achieving appropriate reverberation times. (See Table 2 and Figure1)
In Part 1, the impact of room volume on room gain was discussed. Given the internal volume of 594.4 ft3, the room gain was likely to be between 5 and 20dB at 20Hz. Not only was the low frequency boost of interest, but also the vehicle's room gain, or "transfer function," across the entire frequency spectrum. Determination of the transfer function would provide design input parameters for the calculation of amplifier power requirements, the optimization of loudspeaker enclosure parameters, and the selection of damping and barrier materials.
| Quality | X | Y | Z |
| 1 | 1 | 1.9 | 1.4 |
| 2 | 1 | 1.9 | 1.3 |
| 3 | 1 | 1.5 | 2.1 |
| 4 | 1 | 1.5 | 2.2 |
| 5 | 1 | 1.2 | 1.5 |
| 6 | 1 | 1.4 | 2.1 |
| 7 | 1 | 1.1 | 1.4 |
| 8 | 1 | 1.8 | 1.4 |
| 9 | 1 | 1.6 | 2.1 |
| 10 | 1 | 1.2 | 1.4 |
| 11 | 1 | 1.6 | 1.2 |
| 12 | 1 | 1.6 | 2.3 |
| 13 | 1 | 1.6 | 2.2 |
| 14 | 1 | 1.8 | 1.3 |
| 15 | 1 | 1.1 | 1.5 |
| 16 | 1 | 1.6 | 2.4 |
| 17 | 1 | 1.6 | 1.3 |
| 18 | 1 | 1.9 | 1.5 |
| 19 | 1 | 1.1 | 1.6 |
| 20 | 1 | 1.3 | 1.7 |
Table 1. Favorable dimensional room ratios.