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Discussion Starter · #1 ·
Its a JBL Northridge E250 and a yamaha HTR-5860 receiver. About 2months ago, I was playing xbox, and a explosion went off on the game. I lost audio from both left and right speakers, no sound would come out. Had to switch them over to the B speaker outputs in order to get my surround sound back. Well just mon., while watching 2012, I noticed bass is real quiet. Do a speaker test through the receiver, and I now I have to increase the decible on the sub channel all the way up to 10db and the gain on the sub itself turned all the way to max. Just to get some bass, and its not a deep, low rumble either. If I turn the db level to 0 and the gain 1/2 way, you get no bass. Is it poor signal from receiver or is it the amp in the sub going south??
The LFE indicator is lit on the receiver, and the green light on the sub comes on when a movie starts.
 

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You have a failed part in the sub amp
.


Jason
 

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Discussion Starter · #4 ·
So which one ??? Sub or amp ...lol As for volume level, I normally listen around -45db to -40db for games and -25db to -15db for movies. That is the volume display on the yahama
 

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Regardless, you need a new receiver. After you get a new receiver, you will be able to tell if there are any issues with your sub.


You can try hooking up your sub directly to a CD player or something, then slowly turn the gain up from 0 to see what kind of signal you get.
 

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Discussion Starter · #7 ·
OK, I took the power/amp board out of the sub. There are 2 big blue cylinders(capacitors) soldered to the board with some tan colored paste at the bottom of them. The one capacitor, the paste is a burnt brown color 3/4 of the way around its base. Then below that on the board on the opposite side, were everything is soldered, their is 2 locations that are discolored compared to the rest. If u hold a light underneath the board and look from the top, the circuits in the board looked messed up... burnt look. Ill post a pic if anyone think they can verify.
 

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Yup, it sounds like you blew your capacitors on your sub amp. If there's nothing wrong with the rest of the circuit board, it's relatively easy to get some new caps and replace them. I got mine off EBay.
 

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You may be lucky and be able to replace the capacitors with the burns (and a few resistors around them if the initial cap-replacement does not work).


In most situations, you would need the service manual and to go meticulously through the circuit until you (possibly) found the failed parts. It is generally not effective to send the amplifier to a repair shop (when the amplifier is not under warranty) because of high hourly repair costs.


The most interesting service manual that I saw was for the JBL PB-12 (that has worked well for me for 4+ years). The first thing that the repair technician should do is re-solder 48 parts on the circuit board. After that the technician can start going through the circuit, etc.
 

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See if it has glitter on it...
 
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