One of the best enclosure IMO is the ABC Box. It'll make any subwoofer sound amazing. Your sub will get extremely low without loosing high end extension. If you've never tried an ABC Box, you're missing out. Believe it or not, even one crappy sub...can sound very very good...and will astonish your ears. The only drawback is the size of the enclosure. This is not an SPL enclosure...it's an SQL box.
The enclosure consists of 2 Chambers (woofer chamber & empty chamber). There are 3 ports in total...all the same length.
1. Determine your desired net volume. I would almost always double the volume of the recommended ported enclosure volume. The bigger the enclosure...the more efficient the output.
2. Model the sub using WinISD as a vented enclosure with 2 ports. Tune to desired frequency using entire net volume. I highly recommend 30-33hz. Disregard the response graph of the WinISD when modeling. (this may sound weird but the ABC responds differently and WinISD isn't able to model the above octave.)
3. Determine the appropriate port area and length with the help of WinISD. The length given will be the same for all 3 ports of the ABC enclosure. (Port area between 10-30% of cone area, depending on the power used).
4. Chambers: The subwoofer chamber must be twice the volume of the empty chamber, NET. For example: Total net volume: 3 cf ---> sub chamber = 2 cf, empty chamber = 1 cf net. (Remember, this is net volume not gross...so be sure to subtract woofer, mdf, and port displacement when calculating.)
Be very careful when putting the box together. It's crucial to attain perfect volume in each chamber...otherwise...your enclosure will not work properly.
Good luck.
Click here for source
Building a Sweet Speaker Box
Linear Mode
