i have a 300 w rms @2 ohm mono amp...want to run to 8" 150w subs..do i need 2 or 4 ohm dvc subs?

you'd want a pair of dual 2's.

series/parallel wiring will net 2 ohms: http://images.the12volt.com/12voltimages/2_2ohm_dvc_2ohm.gif

each sub will get 150w rms.

you can hook them up as is. Im not sure how many ohms are in each sub, but if you bridge them together you can lower the ohms. Example 2 subs with 4 ohms each can be bridged down to 2 ohms. You get more power when you even the the ohms on the subs to match the ohms on the amp. just dont go lower then 2 ohms because you can blow up your amp.