Impact tape - hitting below the sweet stop of the club

Hi

Just wondered if anyone has any ideas what may be possible  causes for  a fairly consistant hit off the bottom of the club face with irons  - I put some impact tape on the club face and most contacts were in the bottom middle of the club face, i.e  below the sweetspot - sort of halfway between the sweetspot and the bottom of the club.

This was both from off a tee & off the mat at the range.

Any ideas anyone would be appreciated

thanks

John

All explained here: John

http://golf.about.com/od/golftips/ss/mishit_tips_2.htm

Could be that your clubs aren't set up properly for you. Might be worth getting custom fitted.