That DITEK surge protector seems like a perfect solution for my case, thanks... But that humm on the Co's coming out of the NEC DSX80 is definately coming from the DSX, not the co's or improper ground (actually it could be a combo of both).
This system which has been out for less then a year will give you a humm if not grounded. We've installed about six of them and have heard that noise each time, all other times I was able to ground it fairly easy though. There have been posts in the NEC forum about this. Again, thank you guys...
