Question about JBL Venue SUB12 Subwoofer

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JBL Sub 12 continues to make clicking noise

I purchased the JBL sub12 venue series and lately it starts to go on standby then power back on constantly. You know the sound it makes when it gets a signal and powers on, well it does this non stop, it constantly clicks because it goes to standby then back on again. I have tried a new line in cord, a different amp (not the sub amp), and different input to the amp, im convinced that it must be something to do with the sub amp thats inside the box. Anyone else have this problem?

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  • g_funkstylz Jul 13, 2009

    Checked the amp and it looks like one of my capacitors is fried, its a 6.8uf 100v radial. Everything else looks good though. Now if I can only find that capacitor. Doesnt look like any shop has it locally.

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I had the same problem and fixed it by replacing the C37 capacitor (see service manual). It was a 47uF 16V eletrolitic capacitor. No external signals of problems, but it was defective according to the capacimeter. I replaced it because it was the part responsible to retain charge and keep the voltage up in the signal sensing circuit (a simple comparator). After the signal gets low or disapear, it would slowly discharge through a 10Mohm resistor (R121).
Replaced for a 47uF 25V eletrolitic capacitor.Everything went back to normal.

Posted on Oct 26, 2011

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Check the audio amplifiers of the sub

Posted on Jul 13, 2009

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Another reason for rapid clicking sound (at ~60 Hz, or as fast as it can) is the C2 capacitor that monitors the presence of AC power. Mine was dry, had to replace it (4.7 uF, 50V), did not have 4.7 uF, but judging by schematics 10 uF works as fine. Moreover, another capacitor - C41 - also dried out and had to be replaced to get sound back (that feeds signal from preamp to power amp). It looks like the guys had a really bad electrolite capacitor supplier, I guess I will have to replace them all in a while...
Manual for JBL: http://www.jblsynthesis.com/downloads/products/prod_115_634504909005466954_E250P,P12SW%20sm.pdf
I actually have Infinity TSS-1200 subwoofer, it uses the same amplifier:
http://diagramas.diagramasde.com/audio/TSS-1200%20Infinity%20Active%20Subwoofer.pdf
It is not the simplest amplifier to fix as it uses rather cleverly MOSFET half bridge switch driver in pulsed 100 kHz regime to make low frequency sound, but on the other hand it does not need large heat sink as it is very efficient.

Posted on Dec 04, 2013

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I would normally ask here "with or without signal going into it"

If it's making noises with no signal, the amplifier needs servicing

if it's when there is signal present, it could be the amp OR the speaker itself.

The speaker of course can be replaced with almost any 12" woofer of the same handling capacity.

Again, if it's the amp, the amp will need to be serviced.

To find out which is the issue in scenario 2, unscrew and remove the woofer and temporarily connect another speaker, putting a low to moderate signal (careful you don't blow the speaker you have temporarily connected).
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Here is the service manual:
http://manuals.harman.com/JBL/Hom/Service%20Manual/Venue%20Sub12%20sm.pdf

You may want to find out if it is still under warranty first.
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I had the same problem and fixed it by replacing the C37 capacitor (see service manual). It was a 47uF 16V eletrolitic capacitor. No external signs of problems, but it was defective according to the capacimeter. I replaced it because it was the part responsible to retain charge and keep the voltage up in the signal sensing circuit (a simple comparator). After the signal gets low or disapear, it would slowly discharge through a 10Mohm resistor (R121).
Replaced for a 47uF 25V eletrolitic capacitor.Everything went back to normal.
The burn under the resistor is present in my case too.

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http://i38.tinypic.com/2mqw58l.jpg

Here's a picture of mine that caught on fire last night.

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