The 565 had the slave connections on the back. There is no room on the 568 for those 4 din plugs.

You can actually daisy chain all of the speakers if you don't want a 511.

Run normal comm from 568 to master speaker. run slave comm from master speaker to another speaker. Run from that speaker to yet another speaker.

Stacey Spears
Co-Creator, Spears & Munsil High Definition Benchmark, Blu-ray Edition and Lighthouses of the Pacific Northwest.