maybe it's something like a compressor that blows air into something to produce a resonating sound.. not very sure.. can not tell with all those pipings..
@josh, I thought so too.. hahaha! it's either you have too get a really "torquey" motor or a smaller pinion to not damage your electronics.. maybe both.
@AB, the sound quality of that SWP will depend on the speaker that you will put in it. and it's better in terms of what?
As the chinese in dragonmart would say. . . "too much talking, too many mistakes. . . small small talking, small small mistakes. . . . . no talking, no mistakes. . . . "