Hi John,
I had a pair of Compacts for almost 10 years. They were great speakers. For larger shows, I needed to add a 15 inch sub for adequate bass. Between that and the fact my Compacts were getting old, I decided to approach the warden (wife) to see about upgrading to the Pro 8s. I'm so glad she grit her teeth and said, "If you have to!"
I created a few Master EQ settings but always found the Yamaha factory settings to be best. I've never touched the Compressor settings. I suggest you use the Flat Master EQ setting (or whatever Yamaha calls the default setting - my Genos is off at the moment) for now and see if the hum goes away.
With what Voice patch are you hearing the hum? Have you tried a different Voice? Can you record it and post it? We'll get you sorted out on this
.