Hi Devilbones,

Axiom used several models of amplifiers for their EP350 subwoofer. You will need to email a photo of the back of your EP350 showing the entire metal plate of the amp and the name under which it was purchased. Here are the email addresses for Debbie and Brent.
Brent : brent@axiomaudio.com
Debbie : debbie@axiomaudio.com

With that info on hand they will be able to give you the proper directions right away when you will phone.

Good luck !

jc