I have a customer with a 4 zone talkback system in his house. He is using the V-2006AHF as the controller with 45 ohm speakers. Everything works fine except when he uses the system there is a single "pop" that comes from the speaker that is called. It happens on all 4 zones. The funny thing is that we initially installed the V-2003AHF and it didn't have this problem. We changed out the system when the customer needed another zone. Is there some way to get rid of the "pop" sound when the speaker gets activated? I talked with Valcom and they said that is how it works.