"Mike's got the wiring absolutely right. I've wired piezos in both series and parallel circuits. Series wiring seems to cut output and deaden feedback; parallel wiring gives more headroom--tends to be "hotter", if that…"
"Second what Ed said: use a sharp chisel to knock the slices out. I smooth with a rasp/file combo, but, remember, that part doesn't show, so it just needs to be "smooth enough"--which means whatever you want it to mean."
thanks b t ,for the gourd cone reso comment sir. it is a kinda new sound.long time ago i was talkin with a guy here and he say somethin bout using wood for a cone,i guess the idea stayed in my head till now. thanks again.