MDF ported enclosure, speaker 10"/25cm, volume 35 liters
MDF bass tunnel enclosure, speaker 2 x 10"/25cm, volume 2 x 35 liters
MDF bass tunnel, speaker 2 x 12"/30cm, volume 2 x 50 liters
MDF closed enclosure, speaker to cut, volume 5 liters each.
MDF closed enclosure, speaker to cut, volume 15 liters.