About amps... bridge

I've a Sony cdx-f7500
front-Magnat Pro 2130 90 rms/180 peak wired to a sony amp 100.2 watts
rear-Coaxial JBl gto 100rms/300 peak
Sub- lightning Audio (Bolt) 150rms/750 peak
and a Toxic amp of 4 channel 250w each Jbl speaker and 500 the Sub

My Toxic Sub as output connections for bridging...
My question is what is that?
what can I do with it?
please Help me...



oh and any suggestions or tips for bettering my sound system


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