get the woofer.. remove the cone but leave the dome.. put a bolt in the middle.. super glue it to the dome.. get a small piece of flat metal at least 1 inch in width make sure that the length of the metal is equal to the diameter of the speaker.. drill a hole in the middle of the metal and sa dalawang side.. insert the pasted bolt in the center.. lock it with 2 nuts top and bottom.. screw the flat piece of metal to the speaker basket through the screw holes sa side.. screw it under you chair.. preferably sa loob.. sa may springs.. get the passive crossover na nasa loob ng speaker.. or better yet.. make a low pass filter.. connect it to the sub out of you amp.. watch a war movie with plenty of bass... or better yet Play silent hill alone in a dark room... get ready to be amazed... VOILA! DIY Tactile Transducer..