I have been using my blue dot 950 for 2 years after going through the "hiss" issues of past. The final fix was quite good. However, just yesterday I noticed increased "hiss" from my Klipsch RF-7s. I quickly checked calibration which was done at -7db master and equated to about -4db on the mains -1db on the center and about +3 on the side and rear surrounds. After calibration I still noticed the hiss from about 10 feet away which is listening position. Also I noticed an audible click each time I changed the trim or master volume level. The stepper sound is prevelant from -55db up to reference of -7db where it grows significantly (which is understandable at that level).

Any ideas on the next steps to trouble shoot this increased hiss. Also, I noticed a slight hum coming from the mains also. After unplugging the cable connection it still persists.

Thanks,
Scott