I was looking at a photo of the connectors and I believe they are different.  Is there anything I need as a go between device to use the 4000's with a Beomaster?   

Thanks

Nothing at all - just regular Powerlink cables

You may have been looking at the DIN / Speakerlink connectors of the Beomaster, as it features those as well.

(Just to make certain: you do mean Beomaster 7000 the stackable pizza box receiver, instead of e.g Beocenter 7000?)

Yes.  The pizza boxes :-)   I read that you can connect one cable to each speaker or you do it the traditional way (one cable per speaker).  The 7000 has 2 Powerlink sockets 1 & 2.  Do I just use them as Left and Right?  I also read that you set the Left or Right setting on the speaker.  

That's right - the Powerlink connectors / cables always carry both L + R signals, and the switch on the speaker selects which one it will be playing.

BL4000's have two Powerlink connectors in parallel, so if it suits your installation better, you can use one PL cable from the receiver to the first Beolab, then continue from there to the other speaker with another cable. You can use either one (or both) of the PL connectors in the Beomaster, they are functionally identical.

So it's in a chain?  Beomaster to Speaker 1 to speaker 2?    Or Speaker 1 to Powerlink connector 1 (Left) and Speaker 2 to PL Connector 2 (Right)?  Are you saying that you can do it either way? 

Either way is fine

Thanks.  You helped me out yet again.   Thanks a lot.