Having spent an evening experimenting and having read the manual!
There are some interesting new features that the 'control' offers over and above the standard 'rear of speaker' set-up.
The 'knob' has four functions, volume attenuation, mute/dim ,just touching the knob or any of the buttons turns the speakers 'on', a two second push turns them off, and it used to 'scroll' through the menu.
Coax nut is up to 24/192 s/pdif
USB 24/384kHz DSD64/DSD128
There is a neat 'preset' feature, you just set the parameters you require and they are entered, useful if you wish to switch from low to normal latency , select input, adjust contour filters...
The new remote for the Kii THREE has arrived and it is good!
Ok the 'knob' on top controls volume,and dressing down activates 'mute' or dim, you can choose which and how much in the menu.
On the rear thee are the additional connectors, USB 2.0, s/pdif, optical.
To connect to your Kiis, simply insert one end of the RJ45 cable (supplied) into the 'control' and the other into the nearest Kii THREE, that speaker is now your 'master' run another RJ45 cable from the 'through' into the 'in' Kiilink on the other Kii THREE.
I am using the USB input on the control to connect my Macbook to the 'control', press play!