Sealed or ported?Hi All,
I have Alpine type R 15inch and planning to build a new box, after calculating the cubic feet the result is 3.5.
so, Is it will be good or better to reduce the cubic feet to 3.0?
Thanks
where did you come up with this at?I would build it 3.5 tuned to 30hz, it looks like you will have a 3db gain at 35 hz and it will be flat at 30hz and at 40hz so a small little hump. If you go up to 4.5 at 30 hz you get about a 4db gain at 33 hz and a 2 db gain at 30hz and flat from 40hz on up. So for the extra cubic foot you really do not gain too much. The higher you tune that sub/box and the bigger you make the box the higher the peak will be. If you go to 3 cubes at 30 hz you have a 2db gain at 35hz and it is really flat on either side of 35hz. So actually 3 cubes at 30hz gives you the flattest response but if your box is already 3.5 after all displacements I would stick with that and tune low around 30hz. Fyi if you go 3.5 tuned to 36 hz the peak is at 40hz at 5db's which a pretty nasty peak which is ok for spl but for music you will most likely not like it.