Anytime I've tried this, I'm greated with a good old fashioned ground loop that I can't shake. Boxes with earth lift on them only seem to transfer the hummmmm from one amp to the other, and back.
Who's making worthy splitters right now that are (A) able to withstand abuse, and (B) are quiet and useful for recording?
Has to be able to do A, B, or both.









Here's the one I bought: 






