Hi Don, You can use four of the zones and everything will work fine. Our 4 zone system is out of stock because the ISS4 (speaker selector) is sold out. You can substitute the ISS4 with a dual source 4-zone unit, the DSM4, and still use the AMP200 in the four zones with the same volume controls. You can also go with the six-zone kit. Either method will work. Give us a call if you have further questions: 1.888.779.4968, CL/MA 1281.