polk momo burnt

I got a polk momo 15" 4 ohm dvc subwoofer
-400watts rms
and my amplifier is cerwin vega 500.1 monoblock
rms@4 ohms -300watts
rms@2 ohms -500watts
i connected the subwoofer in series connection @ 2 ohms and it was working good for soo many days.But my subwoofer had burned last day when i raise the bass in my remote bass controller. :(
what will be the reason?
please help me :(
i connected it in this way
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Post edited by harinarayanks on

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