MDF closed enclosure, speaker 10"/25cm, volume 15 liters
MDF closed enclosure, speaker 12"/30cm, volume 20 liters
MDF ported enclosure, speaker 12"/30cm, volume 40 liters
MDF bass tunnel enclosure, speaker 12"/30cm, volume 50 liters
MDF bass tunnel, speaker 2 x 12"/30cm, volume 2 x 50 liters