Wayne, just wanted to update my thread. The hum issues are gone. For the most part is was the source equipment.
The speakers are sounding good. Currently running a Fisher 400C with them & the music sounds sweet!
I have the cabinets tuned to 38Hz. Should I shoot for 40Hz? I hope to pick up a microphone soon to get some measurements. I use a Macbook & wonder if REW is a good program to use?