JBL- Remote Subwoofer Level Control - Audio Players & Recorders

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.

is it the remote not working or the receiver not receiving
take your remote and point the lens at the camera of your phone
turn the camera on and when you press the remote button ( any button ) you will see a white dot on the phone screen if it is working

If you have plugged the input to the LFE socket the volume control may not have any effect coz' its ment to be controlled by the AV receiver in this mode. Connect to the L/R scoket ( any one will do ).

TMI.

This is strictly a remote control failure.

Read this procedure to possibly fix the remote:
http://remotes.com/remotes/servlet/rs?a=Display&contents=help_deadremote&uuid=A12963989782821
They also sell replacement remotes.
Or look on eBay, usually much cheaper if available.

Another thing would be to make sure the receiver's remote eye isn't picking up infrared from anything else in the environment.

You have to fill in the details about what you're feeding it (the source and how IT's set up). It won't just >>create<< bass.

From the manual:

If you used the high-level (speaker) inputs and there
is no sound from any of the speakers:
• Check that receiver/amplifier is on and a source is playing.
• Check that powered subwoofer is plugged into an active electrical outlet and is switched on.
• Check all wires and connections between
receiver/amplifier and speakers. Make sure all wires
are connected. Make sure none of the speaker wires are
frayed, cut or punctured.
• Review proper operation of your receiver/amplifier.

If there is low (or no) bass output:
• Make sure the connections to the left and right “Speaker
Inputs” have the correct polarity (+ and –).
• Make sure that the subwoofer is plugged into an active electrical outlet and switched on.
• Adjust the crossover point.
• Flip the Phase Control switch to the opposite position.
• If you are using a Dolby Digital/DTS receiver or processor, make sure that the subwoofer adjustments on the receiver/processor are set up correctly.
• Slowly turn the Level Control clockwise until you begin to hear the desired amount of bass.

If you used the line-level inputs and there is no sound
from the subwoofer:
• Check that receiver/amplifier is on and a source is playing.
• Check that powered subwoofer is plugged into an active electrical outlet and is switched on.
• Check all wires and connections between receiver/amplifier and subwoofer. Make sure all wires are connected. Make sure none
of the wires are frayed, cut or punctured.
• Review proper operation of your receiver/amplifier.
• Slowly turn the Level Control clockwise until you begin to hear the desired amount of bass.
• Make sure that you have configured your receiver/processor so that the subwoofer/LFE output is on.

these a internal power control board defective, send to repair

You can have bad filter caps or the Class D module is going out. I mod my to fix shorted out Module, http://s807.photobucket.com/albums/yy352/budm/JBL%20PB-12%20mod/

Service manuals: Read them to see if you can fix it.
http://manuals.harman.com/JBL/HOM/Service%20Manual/PB10%20sm.pdf
http://manuals.harman.com/JBL/HOM/Service%20Manual/PB12%20sm.pdf

Connect the receiver's Subwoofer Line Out to the Sub's Line In with a single RCA cable.

Not knowing your specific receiver I can only advise that you get into its setup and 1) tell it you have a subwoofer; 2) set the other speaker types you have regarding Large vs Small (meaning can they handle REAL bass); 3) go through all the channel level setup; 4) Rock On.

check the wire terminals under the cone by the spider and make sure that they are both still connected

In the industry - It is called "Turn-On Thump".

There are some manufacturers that eliminate components like noise filters on enry level lines to save money.

There is no way to lessen this noise without ripping the amplifier apart and having a technical knowledge of the way amplifiers work. It would involve hard-wiring a slow charge capacitor in the turn on line so it gradually builds power instead of getting it all at once.

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