Well, yet another reason to upgrade: No 12V trigger!

Guys, my Sim2 projector has a 12V trigger, I think it's an RCA jack type. Since I don't have an electric screen, can I rig this up to turn my Krells on and off?

Thank you.

Meridian 568, Krell KAV 250A2 & 250A3, Oppo BDP 103, M&K 5.1 (S-150 fronts, SS-250 rears, MX-MPS 5410 Pro subwoofer) Sim2 C3Xe PJ, Directv genie