I ticked all boxes in the config program so that I know which one is giving problems. I also tried them one by one. I'll have another go and advise. Many thanks.

Home: BDP-103,G61R, HD621, Quad520f, 2xInnersound amps, 3xQuad ESL-63s, 2xJL Fathom F112 V1 subs, 2x Gradient SW63 subs.
iFi Zen Stream , Audeze LCDi4.