The 511 is a slave patch unit which lets you hook up more than 1 pair of DSP loudspeakers to a Meridian system.

It's quite small (I just hooked one up) and you can even hide it away.

Assuming you want to use the Center as the master (as recommended) following the instructions in the DSP loudspeaker handbook.

The quick diagram looks like this:

M-Lead from Processor to CC Comms Input.
S-Lead from CC Comms output to 511 Slave Patch
S-Lead from 511 Slave patch to Left Comms Input
S-Lead from Left Comms Output to Right Comms Input.

As an FYI, you can put the 511 slave patch box just about anywhere, and putting it near the loudspeakers allows you to minimize the length of the S-leads.

Hope this helped.

Best,

Surround Music Fan/Computer Geek/Curmudgeon in training.
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