Designing and building your own subwoofer for your audio system can be a great way of improving its sound. Building your own subwoofer is really not that difficult (especially if you get a relative or friend to do the woodworking for you!), and makes a great starting point for the beginning DIY speaker builder.
Why should you build a subwoofer? Well, frankly most loudspeakers, particularly the smaller ones, are simply not capable of reproducing the lower bass frequencies (no matter what the specifications claim). If the loudspeakers are relieved from trying to play the lower bass frequencies, they will sound better at higher volume levels. Finally, a subwoofer can be located anywhere in your listening area, which provides you with much more flexibility in positioning your main loudspeakers for good sound.
Five basic types of subwoofers systems are covered here: sealed, ported, bandpass, passive radiator and transmission line systems. The links to the left provide more information on these systems, along with other information that will help you to design and build a subwoofer that meets your needs.
Are you trying to put together your own subwoofer design and you're looking for information that doesn't seem to be on this site? Please post your request on my Subwoofer Discussion Forum, where fellow DIYers like myself can offer advice and assistance.
Not interested in building your own subwoofer? Well, the information on this site can still help. The more you are familiar with subwoofer design concepts, the better position you will be in shopping around for a subwoofer (or subwoofers) to suit your stereo or home theatre system.
Note: To use any of the equations or spreadsheets given on this site, you MUST provide the T/S parameters for the driver that you want to use. If these parameters were not provided when you purchased the driver, or you believe that they might be incorrect, you can measure them using the techniques provided on this website. Please note that all of the calculations included on this site assume that you are using the DUMAX definition of the T/S parameter Xmax. If you are using the coil-length - based definition, replace Xmax with Xmax*1.15 in the power response calculations. Also, the excursion calculations provide figures for peak excursion - many box design programs give rms excursion results.
PS: Interested in producing the rest of the audio spectrum? Try this site for more assistance! - http://forum.diyspeakers.net/