The subwoofer hums after music is turned off - Boston Acoustics PV800 Subwoofer

Try the following steps to stop subwoofer hum.

1. If the subwoofer is plugged into its own outlet, plug the subwoofer's power cord into an outlet shared by the other components. Use an extension cord if necessary.
2. If the hum persists, and your system includes a cable TV, disconnect the cable line. If the hum stops, install an isolation transformer on the cable.
3. If the hum persists, disconnect the remaining component cables one at a time until the hum stops. Install a coaxial isolation transformer on that cable.
4. If the hum persists, install a line-level ground loop isolator on the subwoofer's line-level feed cable. This usually solves most hum problems.
5. If nothing helps, disconnect all the audio cables from the subwoofer. Leave the subwoofer plugged in and switched on. If the subwoofer hums, it points to a defective unit. Contact the company's customer service to technical support.

Does the subwoofer have the same hum when the input cables have been unplugged? Many input cables use very fine conductors, which often fail. A bad cable will often introduce a hum and prevent a signal from getting through. If the noise is still present without the input cable(s) connected, then repair options are limited. No schematics are available. There's a daughterboard that has been available, but its failure usually causes the system to die (short-circuit). The cost to repair the amplifier may be close to the cost to replace the entire sub.

When it only hums when you turn On the stereo, check the cable and connections .

When it hums, even without anything connected to it, then it needs repair

you may have a groung problem in the wireing of your home, buy a 110 ground tester at home depo and check your home wireing

If you get your system up and running and hear an audible buzz or hum, the first culprit to look at is either the powered subwoofer or your reciever feed at the entry point to your system.

If you are a rock music lover, chances are the speaker has burn out. try to turn on and place your ear near the speaker and listen for humming
sound. if no sound at all, then its the speaker

This may indicate a ground loop problem. Try to have the power supply for the speakers and the music source plugged into the same outlet. Try another connecting cable if possible.

It's also possible the power supply for the speakers isn't working correctly. There are filter capacitors inside whose job is to smooth out the voltage that would make such hum. They may have bad connections to the circuit board inside (a common problem) or may have gone bad. You can check for and possibly repair these problems yourself if you've done any electronic soldering, or see if a TV shop in your area would give an estimate.

your circuit board is bad not repairable i have the same prob but not kenwood they said it would cost more then its worth.

have you checked your music source? Some systems like computers have a sort of output first before normalizing, which isn't your powered subs or powered amps problem. Try plugging in a regular solid state player like an ipod if the humming is still there when automatically turning on or off...

Hi There, Please advise us what happens when you turn off the sub woofer is the hum still there....??

From YUBEUT.