I have a pair of MA12p that are currently in Woden reflex boxes (c.18 liters). A year or so ago I did an experiment using these with the port sealed and crossed to a 12 inch woofer in a box of about 60 liters using a first order series cross over, and the results were quite good. The project was put on hold when I downsized and moved, but now I am ready to give this project a new life. The question I have is regarding the volume for the 12p using it as a sealed midrange (should the volume be reduced?). I had originally planned to cross it at about 200z, but i played around with components and wound up liking the 12p at around 300 and the 12 closer to 400. Thanks for your help.
The woofer is crossed at 400hz and the mid at 300hz? Normally that would make a bump in the response with a 1st order XO. Depending on drivers it could be OK though. If you like it why change anything?
As far as a smaller box goes you don’t really need to because you are crossing over much higher than the box tuning. Adding bracing inside the box is a good way to take up space and get rid of resonances. If you want to hear what a smaller box sounds like cut up some 2x4 and put it in the enclosure to take up some volume.
As far as a smaller box goes you don’t really need to because you are crossing over much higher than the box tuning. Adding bracing inside the box is a good way to take up space and get rid of resonances. If you want to hear what a smaller box sounds like cut up some 2x4 and put it in the enclosure to take up some volume.