Mordaunt-Short Avant 904 Specification
| System type | 2-way |
| Enclosure type | Bass-reflex |
| Frequency response ± 3dB | 50 - 22000 Hz |
| Nominal impedance | 4 - 8 Ohm |
| Amplifier Requirements | 15 - 100 W |
| Sensitivity (2.83V/1m) | 89 dB |
| Tweeter | 25 mm (1 in.) soft dome |
| Woofer | 130 mm (5 in.) |
| Dimensions (H x W x D) | 800 x 165 x 340 mm / 31.5 x 6.5 x 13.39 in. |
| Weight | 10 kg / 22 lbs. |
