Thank you for the kind assistance and help from those that helped thus far.

Is there anyone that has a schematic/circuit diagram of the 5500 PCB COM Board, please?

I am trying to assess why I have no output on the two bass drivers i.e. only output on the tweeter and midrange on the one speaker.

The older boards work 100%.

Thank you.

Meridian 568, 562 v2, DSP5500, 2X B&W PV1 & Velodyne Subs, Velodyne SMS1 Controller, Linn LP12/Ittok LVII/Hercules/Ortofon Cadenza/PS Audio phonostage, MiniDSP4X10, JRiver..