No. The system had to be registered to expand beyond 4x4. I have a 12x20 box working just fine and it started to play as soon as I registered it.

I'd check the seating of the expansion card and reregister the system. Yes, I know you don't have access to the dealer website. I guess that's where we jump in and say CALL YOUR DEALER.

The second power supply is only needed when you add the 5th non-76/DT phone.


Carl