Can the Qu-SB be used with the DX168 at all? We already have a setup with the SQ6 and a DX168 but want to get a Qu-SB for our practice space so all we need to bring with the existing setup is our stage rack which has the DX168 in it.
Short anser: no.
They both ‚talk‘ a different network protocol. You can use the DX168 only with dLive and SQ. And you can use the QU-SB with the stageboxes AR2412,AR804 and AB168 or, when you do not use stageboxes on the QU, you can connect the QU to the SQ.
The SQ can ,talk‘ different protocols via SLink but always one per SLink-connector at any given time (there is a SLink card available to add an extra SLink connector).