it's funny this thread pops up. i just got finished doing some tests on the sub-kick i decided to build a few days ago. I'm in the preliminary stages right now. just hooked the wire to the speaker to see if it'd work. and it does.
i used a 8" subwoofer from an abandoned car stereo setup. works fine from the sound of it.
my biggest question is what to use for the built in pad. the signal coming in is too hot, and an inline pad must be installed.
this site:
digitaldrummer.net - Sub-Kick project, which i found on g.s. on another thread of this very topic suggests a 10k with 1k shunt, but goes on to say this may not be optimal.
my question would be, what values would be optimal?