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amplifier - Connected my audio input to two music systems by splitting the input, but the one with subwoofer produces continuous 100Hz hum - Electrical Engineering Stack Exchange
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Jensen Transformers ISO-MAX SUB-2RR ISO-MAX 2-Channel Low Frequency Audio Input Ground Isolator / Hum Eliminator
Why does my home subwoofer hum when power and RCA is connected? If I disconnect the RCA, it stops. How do I fix it? - Quora
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