[MeAtWork]

Problem with sub:
The sub keeps bouncing back and forward and making somekind of a chopper noise. If the bass starts you can hear the sub trying to go with the bass but also keeps bouncing against the bass which doesn't sounds good. (and I think isn't good for the sub either)
I have made a drawing of the way the sub is connected and how the amp. settings are set. In the instruction manual of the sub it says that it is 2x4 Ohm but connected this way it is 1x2 Ohm.



ANY IDEA WHAT THE PROBLEM IS AND HOW TO FIX IT??