Out of curiosity, when the C Series was first introduced were the new face plates backward compatible to the SSTs at that time as the older threads I have read all suggest and if that was the case what changes were made between the C Series designs then and now. The only thing that I can find searching through the threads is the change of the writing on the membrane switch from 'SST Power' to the model number.
As an aside, I am soon to be the happy owner of another 4B and a 6B which were ordered a week and a half ago. My dealer was told at the time of the order it would take around 2 weeks, the waiting is brutal

. Can't wait to get them in the system and finally have Bryston power for all channels.
Rod