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MV intercoms are not for everyone.. the mikes have to be right agaist the lips, making it hard to smoke.. the things are hot and sweaty. they cost a bunch of money, but having one that is working well is a joy. Note that on the RT unit, there is a separate audio amp in the radio that is for...

You can connect a LS-454 speaker (as used with RT524/246) to either jack on the crew box and should hear it. If the amp is working and crew box and headset are switched to intercom, you should hear a small amount of background hiss in the headset or speaker. Note the headset audio power level is...