Robert, thanks. You are giving some things to think about and therefore, some options I need to explore. Let me first explain the setup process :

1. The older boards on both speakers worked 100%;
2. The newer boards fitted, no sound but power on;
3. Software loaded on Master speaker and on switch on/power up, both speakers play music;
4. I then check that all drivers are working and not that on the Slave speaker there is sound from the tweeter and midrange, however nothing from the bass drivers;
5. I removed the "new" board from the Slave speaker and replace it with the older one, power up the system again and everything is in order, i.e. ALL the drivers are playing music. That lead me to the conclusion that the board is faulty.
6. I replaced all the cables with brand new ones, digital and comms.
7. I have owned and lived a set of DSP5000's with 3 Meridian CD players for many years so do understand how the the communications and digital connections work ( just for clarity ).

Considerations :
1. I did not "Flash" the Slave and should try that?
2. Maybe, the Flash Upload is not complete or done correctly. [ I do notice that the display on the Master speaker does not give all the information I previously had, so suspect?]3.
3. Unfortunately, the current agent is 1500kms away and shows no interest in Legacy equipment and are only interested in replacing any faulty equipment, no interest in servicing and very difficult to get information/assistance from.

Please, if there is anything else I need to consider any help/ guidelines will be appreciated. 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..