I notice that in a lot of sms 1 screen shots everyones graph goes straight to 200 hz,mine dips all the way down at 125. any reason?

You may be running your sub hotter than the rest of your system, and that is the point where the sub begins to "hand off" to the other channels. Did you use the SMS-1 to set your sub level initially?

I have the mains and the sub leveled off at around 80db. I have a pbs-12 plus and its gain control is only 1/4 way up and I have it set to 20 hz.