“I have connected an Insignia converter box and antenna to an older model TV using a balun adapter. There is now a buzz when text appears on screen. Can the modulator be used to attach external speakers from the converter box to the TV to eliminate this?”
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It sounds like you need a filter to help eliminate the feedback. If the text is coming from having the closed caption turned on, you might try turning that off unless it is greatly needed. Otherwise, I would contact a local Audio/Video technicians for advice or repair.
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