Loudspeaker line load box KN-M is designed for the matching end of the warning line in the RECOR-M system, which is necessary when probing the line with signals of supratone frequencies and allows to detect the break (XX), short circuit (short circuit), as well as other significant changes in the impedance of the line during its operation, both in the silence mode and in the mode of warning or music broadcasting. The load box is installed at the end of each public address line.
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