CONNECTING AN A/B AMPLIFIER SWITCH FOR LOCAL SYSTEM SELECTION
ANiles SPK-1 Voltage Activated Speaker Level A/B Switcher connects to both the ZR-4630 and a local system
to provide sound from each system to the same speakers located in a single zone. The local system only con-
nects to the speakers when the local system is turned on. The Niles ZR-4630 connects to the speakers by default
when the local system is off.
In Figure 39, the Zoned Speaker Output of the ZR-4630 connects to the "A" side of the SPK-1. The Main Speaker
Output of the local system connects to the "B" side of the SPK-1. In addition, a 12V DC power adapter (Niles
FG00665) is plugged into a switched AC outlet of the local system to activate the SPK-1.