I used this Xantech IR Kit kit in my sytem (boy, those prices have gone up...) and the IR out from the Outlaw pre/pro to trigger an Outlaw 7125 amp (see edit comment).
I even replaced some of the LED emitters that came with the kit with male-to-male mono minijack cables from Radio Shack for direct-wire links with my Outlaw pre/pro and satellite box. Worked flawlessly and none of my gear behaved in any way erratically.

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Edit: Instead of modifying my post, I will leave my error for all to see. I just realized that I am not using the IR out but the 12v trigger. Hmmm. So I can only attest for the IR input working flawlessly...