А вот что мне написали господа из Celestion:
Im afraid we dont have cabinet drawings available. The BL12 will work well in an internal volume around 40 - 50 litres tuned to 45Hz with a 75mm diameter tube with a length of 110mm. The BL15 works best in a larger 90 - 100 litre volume tuned lower using two 100mm diameter tubes 200mm long. The tunings are quite flexible for bass guitar and making the tubes longer will give you more bass extension and shorter will give you more punch and you should let your ears and playing style decide what you need.
regards
The Doctor
Так что все правильно...
Im afraid we dont have cabinet drawings available. The BL12 will work well in an internal volume around 40 - 50 litres tuned to 45Hz with a 75mm diameter tube with a length of 110mm. The BL15 works best in a larger 90 - 100 litre volume tuned lower using two 100mm diameter tubes 200mm long. The tunings are quite flexible for bass guitar and making the tubes longer will give you more bass extension and shorter will give you more punch and you should let your ears and playing style decide what you need.
regards
The Doctor
Так что все правильно...