When using the PC-580RU as a talk-back speaker for some intercoms, it may be necessary to remove the DC blocking capacitor.
Some intercom systems are sensitive to the capacitive load that the PC-580RU presents to the circuit.
This capacitor is required for Fire Signaling use and removal of the capacitor will void UL-1480 compliance.
Simply cut the black wire and insert it in the negative terminal of the grey terminal block.
Note: If the capacitor is removed, the speaker will not comply with UL-1480.
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