Fixing an humming subwoofer
After working fine for years, suddenly started very loud hum.
Audio Players & Recorders - Boston Acoustics - Horizon MCS130 5.1 10in 200w Sub & Speaker System Black
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Answers & Comments
Filter capacitors in the amplifier or a broken ground (shield) wire. Check if there is a ground lift switch in your system and try it in both on and lift positions.