The VC-5S is two volume controls in one. It's a VC-5A with the option to jumper out the Automatic impedance protection when it is not needed. The VC-5S works equally well in either mode but requires the installer to correctly set the controlling jumpers. With the jumpers in Automatic impedance protection mode the VC-5S protects your amplifier from overload exactly the same way the VC-5A does, no difference. The VC-5S allows up to eight rooms of distributed stereo audio from a single amplifier. With the jumpers in No protection mode, the impedance padding removed, the volume level increases allowing a lower power, less expensive amplifier to be used. This is a great setup for one or two rooms of distributed stereo audio. The VC-5S is perfect for starting out with one or two rooms of audio. Later if more rooms are added simply change the jumper position to Automatic protection mode and drive up to eight rooms from a single, perhaps higher power amplifier. No need to replace the existing VC-5S volume controls.
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