Here is required reading for rigging flyable speakers from ATM-Flyware:
http://www.atmflyware.com/downloads/riggermeister%20guide.pdf
If you don't do it correctly, DON'T do it at all.
http://www.atmflyware.com/downloads/riggermeister%20guide.pdf
If you don't do it correctly, DON'T do it at all.