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If an ISM/DSSM speaker selector is used with impedance-matching volume controls (VMT100/VSL125 IM), should the protection circuit on the speaker selector be switched on or off?

April 26, 2017circuit controls ISM Selector speaker Used volume

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If an ISM/DSSM speaker selector is used with impedance-matching volume controls (VMT100/VSL125 IM), should the protection circuit on the speaker selector be switched on or off?

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If the volume controls are properly configured for an acceptable system impedance, then the protection circuit on the speaker selector should be switched off. If the ISM/DSSM selector is used without impedance-matching volume controls then the protection circuit should be switched on. When using the ISM device with the protection circuit switched off, the impedance jumper settings on all VMT100 must be set for the amount of VMT100s connected to the ISM selector device.