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Sounds like it might be feedback from another source or perhaps a loose connection. Try moving the microphone away from power sources or anything that might cause feedback, such as speakers etc.
Check the speaker connections it looks like there may be a feedback signal going back to the internal amp. If those are fine then the amp itself is clipping and you need to have the player checked.
are you using more than one amplifier? it sounds like you may be using the blue wire to turn one amp and and the blue/white to turn the other one on. use the blue/white only. the blue wire is antenna remote and turns off when not in tuner mode.
Though it may have become damaged in the original problem, the driver won't make loud sounds by itself in the absence of a signal. The internal amp is probably malfunctioning and it is very capable of destroying its own driver. Don't let it continue when it starts acting up.
Did it work correctly for more than 5 minutes after the driver replacement? Take it back and make them do it right this time.
I had a powered sub amp problem that the local guy couldn't fix so I just disconnected it and wired the driver directly out to a separate amp. Works fine as a passive sub.
Sounds like the sub is blown. Swap the two subs and see if the sound comes from the other sub in the original location as well. If not, then you have a bad sub. If the bad sound happens with both subs then you need to look at wiring and the Amp.
You didn't say is your sub active or passive.If its active first check signal cables from theater system,power line of the sub, it has to be the same phase as the system.If its passive take a voltmeter disconnect the sub from the system and measure for DC voltage on the SUB output on the system when its OFF.If DC voltage is present your amp is damaged.It can also be that the preamp circuit for the sub doesn't mute the input when unit is on stand by and you hear frequency of your power supply (50-60Hz) on the sub
You need to check your ground connection. If there is a bad ground there will be feedback to the amp and it will just sit there and loop back with the Thump, Thump, Thump sound. I had to wire my amp's ground all the way back to the negative battery terminal. It was a pain but I have never had a problem since :)
If sub has two signal outputs and if the monitors are full range (passive crosover built in), put mixer outputs to the sub and signal outputs of the sub to amps in.If not mixer outputs to th amp and its signal outputs to the sub in.Or you can use main out of the mixer for the monitors and rec out for the sub.Its just few XLR or jack cables extra.Just make sure that the mixer,sub and the amp are on the same power phase otherwise you'll have brrrrrrrrrrr on the speakers
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