could some explain to me please how i would mic up my bass drum using a speaker from an old amp? ive seen this technique used before but i dont know how i would hook it up to the p.a or convert it so the signal runs the other way etc. any help would be great.
p.s i did and search and couldnt find anything as i know this has been covered some time ago

Found it:
http://community.drummercafe.com/index.php?board=8;action=display;threadid=2019