OK guys: The problem was the water meter. A new one fixed the noise resonating all the way from near the street (meter location) to the house. What I learned here is that a charged PVC pipe can send vibrations over 50' downstream, and the resonating and vibrations were caused by the two zone with the most heads. Maybe this prognosis will help someone here. So, if you encounter this first, go to the meter. I could see it resonating through Copper pipe, but PVC? The plumber said if it was a pipe under constant pressure (ie. the house water line) it can send the vibrations very far. He was right, me wrong, as I doubted his fix.