The goal of this project was to be as cheap as possible. You'll want eight (8) loudspeakers. I would have used these speakers:$5.50 speaker
but All Electronics was out of them. I got these, instead:$7.50 speaker
The important considerations were an impedance of 8 ohms (which is normal for home stereo speakers) and good frequency range. (in this case 70-10k Hertz). Sound localization is more acute at higher frequencies, so response >1k Hertz is especially important. It would be better to add a sub-woofer to make up for thin bass, than to have no high end.
While at All Electronics, get some Speaker Terminals
I used four (4) "quad" terminals, but the four-pair ones look good.
(NB: If all electronics doesn't have these anymore. Try Parts Express or Radio Shack
The other major elements in this project are the bowls. They cost $5 at IKEA:Reda Bowls
Insanely cheap. Get two (2) sets because you need two of the biggest bowl. They also come in white. I imagined using one of each color, so this project would look like a big fishing float. Ultimately, though, solid red seemed best.
UPDATE: These bowls are no longer sold by IKEA. Sorry.
Finally, the miscellaneous hardware. 8 speakers x 4 mounting holes = 32. My local Ace hardware provided 32 machine bolts, locking nuts, and washers. Also, pick up 8 small nuts and bolts for the terminals. Most of the speakers were fine with 1/2" bolts, but the top and bottom ones needed longer (1 1/2") ones, as you'll see later. This may vary, if your parts are different.
- weather stripping
- speaker wire ( I had some 18 gauge stuff lying around the house, the project only needs a few feet.)
- heat shrink tubing