This build is long and complete. The end product is a premium sounding subwoofer, which when bought in stores would sell over $1000. Parts and tool will cost you about $200, so this is really something that you could try out in order to end up with something that sounds really good. The assembling of the casing takes up quite some time and you need to be precise. Afterward, there is some welding and you need to set up the wiring, which requires an experience and familiarity with electrical wiring. The building of the casing is more complex than the wiring, so if you are comfortable working with wood, then you should try this build out.
His step-by-step tutorial describes in detail what you have to do. McGrath uses MDF as a basis for his speaker. He also details why he chose to build this specific type of subwoofer. The reasons get technical quickly, but needless to say they are informative. This subwoofer is 6th order, isobaric, bandpass and series tuned. To find out more, read his detailed tutorial.
The parts will cost him about $190, but you might be able to find cheaper parts in the US since he built his in the UK. The fact of the matter is that you are building a premium quality subwoofer, not a cheap sounding one. McGrath has done all sorts of tests to assure himself of the quality of the sound. There is also a bit of mathematics behind this build, to optimize his design. This doesn't really concern DIY-enthusiasts, but it's good to know that a lot of thought went into the design of this subwoofer.
18mm MDF 2400 x 1200mm sheet
380ml uPVC solvent weld glue
2metre 4" Underground Soil Pipe
2metre 3" heavy grade rainwater
10" Eminence Beta 10 Loudspeaker
Neutrik Speakon Panel Socket
Neutrik Speakon Plug
Speaker covering carpet
8 x M8 Hex Nylock Nuts
8 x 2" M8 Bolts
8 X M8 flat washers
100 x 2" #8 Woodscrew
1litre resin W wood glue
310 ml tube No More Nails
300 ml tube clear bathroom silicone
[Photos by Dan McGrath]