L-R - R-L circuit for extra speakers

Thanks Bill, now my hunt continues with some sort of direction. I will see if I can get my hands on that circuit drawing.Maybe someone else has another idea?

Doesn't the Chase Technologies processor embody the Hafler circuit as well??? A passive device that could be used several ways--speaker outputs into the Chase/ front & rear speaker level outputs or speaker outputs in/ front speaker out and RCA outs for a seperate amp(s) for rear and center.
I'll dig out the manual if I can find it; it was a fairly reasonable device ($100 or so) when available.

I've got a schematic for such a circuit in a blue book titled something like Experiments in Audio.

http://members.tripod.com/martin_leese/Audio/hafler_circuit.txt

This site has rudimentary info on Hafler circuit.

Scanned a review of the Chase if interested:
http://mywebpages.comcast.net/brighter/

Click on page you're interested in