How do i find the center of a speaker front plate ?

I need to find the center of the front speaker plate first, then mark out where the holes go ? How do i do this ? surley someone made a box on yahoo answers.

?2016-02-11T11:21:40Z

Frightening. Don't they teach math in school these days? Measure from one side to the other then divide by two. I use a combination square and a pencil to mark the lines. I also never mount drivers on center. I make them offset and "bookmatch" the pair of speakers.

?2016-02-10T21:27:07Z

Use a measuring tape. Mark the half on height and you've got the center.

inconsolate612016-02-28T14:58:09Z

Raw drivers come with complete spec sheets, and often, hole templates.