I'm building a box for my girl, and have designed a pair, one aeroported and the other slot ported. These are going to be for a memphis power reference 12" woofer. Memphis gives an optimal ported box volume of 2.25cu ft, port area of 18.75sq in, and port volume of 318cu in. These specs tune the box to 38hz though, which is too high. I'm shooting for 32 hertz.
First is the aeroported box, 2.4cu ft and a 3in aeroport which is 5.56" long. gives me 7sq" of port area and 39cu" of port volume. This seems a lot too small, but i used two different calculators and both said this would tune me to 32hz.
By toml364 at 2011-12-18
Second is the slot port. used the RE Audio box calculator. Box volume is 2.75cu ft, port area is 36sq" and port area is 1,060cu ft. Tuned to 32 hz again. Can't decide on the best place to mount the woofer on this box. should i put it in the center of the front panel like it is, push it over next to the port so it's in front of the rear port wall, or over to the other side so it fires directly to the port (and doesn't hit the wall)
By toml364 at 2011-12-18
Thanks for lookin!