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Some/most Sub Woofers have a Switch that turns them Off/On/ or Auto. On Auto, the Sub only turns on when there is a signal present. ( sound coming into the Sub ) When there is no signal, the sub goes into standby mode. Wireless subs may be made to be in standby mode as the default.
from our experience rebuilding woofers once the lead wires get pulled too much or start to strain you have been running too much power into the woofer and making the cone move too far in and out.You need to cut the input signal from your preamp down and cut the volume down on the speaker input on you eon. We keep seeing too many of these amped speakers blown from too much signal.
I am an Electronics Tech and just finished repairing a LW12 for a customer. It also has the HUM. IF I place a finger on the RCA input and another finger on the heatsink..(black metal plate at the back) then the hum goes away. I did notice that Cerwin V maunfactured this older LW12 unit with a 2 prong cord. I personally own a newer CV 10" sub, 3-prong and has never had a problem with it and it has awesome Bass. So for my customer...I am thinking I will add a 3-prong cord. and see what happens.....