i have 2 12" directed dvc 4ohms subs 500wrms 750w output.in the pics shown below r these configured at 4 ohms or 1 ohms?The wire conecting them both on the outside of the box has thrown me a bit. o and this is the amp im getting to run them http://cgi.ebay.co.uk/KENWOOD-KAC-91...3300 78612864