Question about Altec Lansing VS4121 Speaker
Pop open the back side of the sub and see if the to connections are soldered firmly to the wires/drivers themselves & make sure your system is grounded meaning the 3 pronged plug has to have the 3 post still connected to the power cord. If its broken off as most people do it'll cause that feedback or dull hummmmm noise.
Posted on Oct 15, 2013
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Posted on Jan 02, 2017
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