MDF closed enclosure, speaker 10"/25cm, volume 15 liters
MDF closed enclosure, speaker 12"/30cm, volume 20 liters
MDF bass tunnel enclosure, speaker 10"/25cm, volume 35 liters
MDF bass tunnel enclosure, speaker 15"/38cm, volume 70 liters
MDF bass tunnel, speaker 2 x 12"/30cm, volume 2 x 50 liters