Dear Steve, Hope you can help me on this one. At this moment I have connected 4 Beolabs 6000's to a Teufel Decoderstation 5 (5.1 pre out Dolby and DTS decoder). I don't use the RCA connectors on the Beolab's but the powerlink connectors. On the serial output of a Lintronic (TT455-RT-238) I use the two TTL 5v outputs to turn the Beolabs on