Hi Bry57,
Sorry for the frustration this has caused. The wires should be pushed into the J box when securing the sub base to the wall. If you need some help please contact Customer Service directly at 1-888-346-7539, Monday to Friday 8am to 4:30pm EST or by email at cs@glendimplexamericas.zendesk.com.
Glen Dimplex Americas Customer Experience Team.