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JL Audio f112 blown speaker?

I have/had a JL Audio f112 and I absolutely love it. About 3 months ago I changed my processor from a B&K Ref 50 to the new Classe SSP800.

About a month later my f112 started, for lack of a better term, started screeching, when I would play it. I have no idea what happend, but I unhooked the XLR connection and it would continue sporatically, even without any signal.

JL Audio was absolutely great. I sent it in and 5 days later a new one shows up at my door. Now after a month the same thing has happened with my new one.

I'm not playing them loud at all. I play video games, watch movies and listen to a lot of music.

Something is up and I am clueless what it is. It must be something in my system causing this. Any suggestions?
rshad0000
rshad0000 OP
269 posts
 
Also...I have the sub, speakers, amps, processor and TV all on one circuit. I know, not ideal at all, but my room layout doesn't permit much else.
statman's avatar
statman
285 posts
 
Put your sub on an seperate circuit if you can.Try using a heavy duty extension cord and run the sub to a different outlet away from the rest.The JL's have a limiter of sorts built into it. I found it running test tones thru it, didn't damage it at all and I found the absolute max I can drive the Fathom to. Did you calibrate the sub using test tones to the recommeneded 75 db setting?
soundoctor
7 posts
 
a) have you contacted your dealer?
b) since the JL factory has helped you already, are they helping you now?
c) if you have NOT done (a) or (b) why would you be asking on here?
d) The above poster Shadorne has a very good point. I suggest you carefully check your interconnects and also, if possible, examine or have someone examine the signal at the sub end of the cable with a scope to determine what is really going on. There have been instances where preamps do such things as oscillate outside the audio passband and put out lots of voltage while doing so.

If you need any additional assistance with this then please contact me.
Barry
rshad0000 OP
269 posts
 
After sending in my subwoofer to JL Audio they tracked down the problem to a preamplifier component in the sub. I beat the odds and got two of them with the same exact issue in a row.

JL Audio's service can not be beat and they have taken care of me again.
shadorne's avatar
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shadorne
7,477 posts
 
After sending in my subwoofer to JL Audio they tracked down the problem to a preamplifier component in the sub. I beat the odds and got two of them with the same exact issue in a row.

Sounds like they changed supplier or got a bad batch. These things do happen even with great products. Funnily enough though - the HT Shack Subwoofer tests reported another problem with the JL sub they received for testing - so this incident may not be as isolated as it seems - check the HT shack subwoofer test forums for details. I don't remember what it was - I seem to remember they observed significant audio compression below 40 Hz at high SPLs..
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