On a lot of M kit the analogue and digital outputs are both "hot".

If so with the 568 then if you set the left and right speakers to large in config then the bass will be transmitted on the XLR outputs as well as the digital outputs. Issue with this is how do you at the same time dial down the bass on the DSPs that are getting the same signal.

There are dedicated left and right unbalanced sub outputs that might give you a better surround experience if you used them.

Sooloos, Roon, G series (with LPS upgrade), 800 series (with LPS upgrade), HD621, AC200, Prime and PS, DSPs old and new.

Purdeys, Moke, Leica, 'Blad. Only the best.