i have built stand alones for se's and normal zip zaps, for the zip zaps i highly recommend not using anything above 3v and for the zip zap se's i was plugging in 7.5 with no problems if you want to try 9 be my guest, i made a post along time ago about a part you can get from radio shack actually someone else had done it before me i beleive its rfnagel dont quote me on that but look around you will fiind the posts and it is the answer a simple mountable coaxial jack, i highly recommend it dont mess with soldered wires