Question about JBL PB12 Subwoofer
My subwoofer used to work perfectly, but after I unplugged the power once without turning the unit off, it stopped working. Even after giving the LFE input from my Harmon Kardon receiver, the light remains red. Plus, it makes loud "Dhoom" sounds intermittently when power is on.
I've got the same problem with my PS-10 from Infinity. It works great for about 30-45 minutes, then click in and out of standby mode. It sounds to me like a overheating safety fault. When I take off the amp panel (unplugged), it feels quite warm, and you can see that there is really no way for heat the escape. I tried running it briefly with the amp panel outside and it seemed to work fine! Since I'm out of warranty, I think I'll try cutting some ventilation holes. I noted there are 2 oval shaped holes near the bottom (just above amp), but covered with the panel sticker. I'll try cutting those open first.
Posted on Dec 19, 2009
Sometimes bad caps show a lifting or rounding of the top of the cap, sometimes this top will split from heat and pressure and sometimes it will not show any sign of damage but will be dry inside and its capacitance value will drop to a very low value. Replace the big power supply caps and test again. Get the same size, value and voltage rating. You can go higher on voltage rating and a bit on value. Getting a similar size or something that will fit in the same space is important also.
Posted on Mar 24, 2010
One year waranty period from JBL on the electronics. To find the authorized JBL service center in your area:
To find the authorized JBL service center in your area:
Posted on Nov 23, 2010
Hi well i would think that perhaps a capacitor in a cross-over network may have failed? What top do is open up the speakers and locate the capacitor, and inductor, cross-over network, that's the part that splits the frequencies to each speaker, hi, mid, bass, and simply replace the capacitor "On Spec" as it were, this or simply replace the entire cross-over network? this may help. It's worth a shot anyway? It also may simply be a bad speaker? again replace "on spec".I don't think from what you describe that you have "Overlooked" anything at all, it's just bad luck.
"on spec' simply means to replace without thinking about it....
Posted on Sep 26, 2011
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