Question about JBL Audio Players & Recorders
My JBL Bass 20 subwoofer quit working after a static electricity shock from my hand. What component would have caused complete outage following this simple static shock?
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Posted on Jan 02, 2017
SOURCE: Thump at the time of shutoff
The amplifier in the sub as with any other amplifier has a capacitor in it. Essentially a battery that holds a charge. When you trun things off such as subs or amps with a powerstrip instead of the intended on off button, the power supply has been cut, but the capacitor is still energizing the unit. So it catches the noise in the line.
Posted on Mar 08, 2008
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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Posted on Feb 10, 2009
it can be the amp or the speaker itself. it has to be diagnosed by a service center.
if the amp is the problem, there can be board replacements or component level repair. if it is the 15" speaker, then it can be reconed with authentic genuine JBL parts returning it to brand new. email@example.com
Posted on Jun 25, 2009
Could be either the amp inside it or an Electrolytic Capacitor in the power section of it. But then again it could be one anywhere, they like making noise when they go. Capacitors are cheaper than semiconductor devices to replace, so you could go for them first.
Posted on Dec 27, 2009
SOURCE: the subwoofer just quit working
if the light still comes on then the fuse is still good....
a possiblity exists that either the amplifier or the actual speaker itself went bad....if you like you can dissasemble the the subwoofer to access the insides....a simple test....if you connect the driver to another amp (any amp will do as this is just a test) and it makes sound then chances are your amp is bad or just a loose connection.
Posted on Oct 28, 2010
Tips for a great answer:
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