I have a dvc 2 ohm Rockford for gate r2d2-10 and a 4ch amp that can bridge 160w x 2. Can I hook each coil ad a brdige to get 160w ish per coil? Sub is 250w@2ohm.
No, you can't bridge all 4 channels together. If the amp is 2 ohm stable when bridged you could run one coil to each set of bridged channels but most amps are only stable down to 4 ohm when bridged.
what I was thinking was doing one coil on 1 and 3 and the other coil on 2 and 4 which i would think would be 2 ohm each and each coil is 2ohm rated. Am i thinking wrong
I can almost guarantee that amplifier will not run bridged at 2 ohms. Your only option would be to run only two of the channels (either one channel to each coil or bridge two of the channels and wire the coils in series).
Your amp probably won't like the load. More importanly you could cook the voice coil if your gains aren't set exactly because you would be sending different amounts of power to each coil of the woofer. Never run a 4 channels on a DVC, that's why they invented bridging.