Hey.. I moved this over into Gear Discussion because people tend to read this forum and respond here more than in Tech Talk 2.. don't ask me why, they just do. :)
Hopefully someone like Lordathestrings will come along and know the answer to this question. It does sound like a simple thing but I don't know where this "Power Attenuator" thing you mentioned comes into play.. I would have thought a simple splitting DI box.. or a PA system would suffice..