That's because those companies want to sell you a woofer, or a box (or both) but don't really care if you understand subs or enclosure design. That way, if you don't get it right the first time, they will gladly sell you a different one!

There is a lot to know about enclosure design and speaker selection, particularly when it comes to system design and set-up. How many of your friends try to tell you they know about sub boxes, but don't even know how to calculate the volume of an enclosure? Can they explain the difference between sealed, ported, or band-pass enclosures? There is also a specification on speakers that confuses a lot of people, and that is impedance, which is measured in OHMs. Want to learn how to wire up four dual-voice coil, 2 ohm subwoofers so that it won't overload your 4ohm amplifer? Want to build a box for those four subs? I can show you how to understand these things so that you can do your own installs, get the best performance you can, and save money! Just click the link below!