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    Invelos Forums->General: General Home Theater Discussion Page: 1  Previous   Next
Subwoofer broke again
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DVD Profiler Unlimited RegistrantStar ContributorAce_of_Sevens
Registered: December 10, 2007
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I have a JBL L8400p. This isn't one of those subs that costs as much as a quality used car, but it's far below the bottom rung. (Retail is about $600 or so.) I bought one about three and a half years ago. Last year, my voice coil melted. This was covered by warranty. Now, it broke again. When I turn it on, half the time nothing happens and most of the rest of the time the standby light comes on, then fades out after a few seconds. If I try a few dozen times, I can get it to stay on, but at best it comes out of standby a few seconds, then clicks back in to standby mode, then eventually power fades out altogether. This is clearly not an issue with the loudspeaker, so it's out of warranty. Hope it's not super-expensive to fix or I'll just get a new sub.

My suspicion is it's a bad power supply. Thankfully, I have a handy girlfriend who may be able to fix.
DVD Profiler Unlimited RegistrantStar ContributorParsec
Registered: June 15, 2012
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A girlfriend who does recones? Wow you are lucky.

Bring it around and we'll recone it for you, using a cheaper kit (JBL copy - but it's just as good).
Ooops.. forgot.. I am most probably a long way away

Anyway if it needs a re-cone you can generally get generic copies that are a lot cheaper then genuine JBL. And you won't notice the difference, as it's the magnet and assembly which is the major design part. Most professional speaker repairers will carry them.

Ooops again.. misread.. so you think it's not the speaker... still could be and it's tripping the shutdown. The speaker will be cheaper to fix.
 Last edited: by Parsec
DVD Profiler Unlimited RegistrantStar ContributorAce_of_Sevens
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The speaker is under warranty, so then I'd just have to haul it to the next town for servicing.
DVD Profiler Unlimited RegistrantStar ContributorLewis_Prothero
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Registered: May 19, 2007
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If you suspect the PSU to be the culprit remove the backplate of the sub and check if it's one you can buy.
For cost reasons many manufacturers simply build in ATX-PSUs (PC component).
They are easy to replace and don't cost a fortune.
It all seems so stupid, it makes me want to give up!
But why should I give up, when it all seems so stupid?


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DVD Profiler Unlimited RegistrantStar ContributorAce_of_Sevens
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My girlfriend does PC repair for a living and has such a power supply setting around in her living room. Thanks for the tip.

It was doing this a few months ago, but after a few dozen power cycles, I got it to stay on and work so long as I didn't turn it off. Apparently, time has run out on that solution.
DVD Profiler Unlimited RegistrantStar ContributorAce_of_Sevens
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Took it apart. Determined the area that makes a crackling noise when I turn it on is the power supply, which doesn't look like any power supply I've ever seen. There's nothing obvious like scorching on a blown capacitor, which means it's beyond my girlfriend's electronics expertise. Off to the authorized service center I go.
DVD Profiler Unlimited RegistrantStar ContributorAce_of_Sevens
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And it seems the authorized service center is out of business. Now I have to find another place. Harman isn't a rare brand, so hopefully should be able to find one nearby.
DVD Profiler Unlimited RegistrantStar ContributorParsec
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Don't you love it when things go so smoothly when your equipment has problems and need attention 
DVD Profiler Unlimited RegistrantStar ContributorAce_of_Sevens
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i tried to get an electronics guy to do it. He diagnosed the problem, but couldn't find the part, so I sent it to an authorized dealer in another town. It will cost $150 and the part is backordered. I ended up buying an old cheap Klipsch to fill in in the meanwhile.
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