Steve has responded and confirmed that 500 and 600 series comms is not compatible. 200 and 600 series comms is compatible. Early model 500 comms may be able to be made compatible with 200/600 series comms, but certainly not the 596.

All questions answered, thanks for all the help and contributions everyone.

Meridian 601 DSP/Pre, 557 power amp, 596 CD/DVD + KEF Reference 105/3
iPad + iPod both with Spotify Premium + aptX Lossles Bluetooth receiver