The Vanco SS4 speaker selector box from RC Willey is a low profile speaker selector unit that allows for distribution of high level (amplified) stereo signals into four zones. This box features a manually activated impedance protection circuit that can be activated to prevent the impedance to a receiver, this protection keeps the receiver from dropping below 5 Ohms, regardless of the impedance rating of the speakers utilized. The impedance protection can also be de-activated, allowing for part of a planned system of impedance with matching volume controls. The result is great sound quality in every zone.
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