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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
 
Yes, thank you for everyones comments and advice. I was seriously concerned that it was something else in my system.

Like Jp1208 I am extremely satisfied with my JL Audio sub. It sounds terrific with movies and music, both, and have no intention of going any where else.
shadorne's avatar
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shadorne
7,477 posts
 
I am also glad I don't hear this compression.

JL use a 3.5" voice coil it should not normally compress too much at high
levels.
However, it appears to be a long coil short gap design which explains the high
harmonic distortion (around 10% and sometimes above). The long coil short gap
would be typical of PA and rock concert woofer designs - some manufacturers
make similar drivers in two versions (one short coil with less SPL output but
better accuracy and one long coil for more SPL) perhaps JL113 may lose power
due to very high excursions (4" peak is an unbelievable excursion- WOW!)
as the coil moves well outside the linear magnetic range, which woudl explain
the compression and THD. There is no doubt it is an excellent sub - one of the
best out there.
jp1208
502 posts
 
I turned up the F113 to levels I would never play normally and watched this excursion. Maybe 1" of excursion outward was noticed. To push this any further is not normal. At least for music. Movies may be a different story and I have had it loud enough to make it feel like my couch was being lifted. With one of these in a room 18' wide 40' deep and 10' high I have been extremely impressed. Two of these in this room will just work that much easier and give more depth and extension. It's going to be fun.
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shadorne
7,477 posts
 
JPL,

4" is peak to peak - so 2 inch in and 2 inch out. This is the absolute maximum - it would probably sound even more distorted than 10% THD at those type of excursions.
jp1208
502 posts
 
One would have to drive this F113 to insane levels before hearing any distortion. As an owner I can promise you this.
The testing that is being done on these subwoofers are not real world. They do show what happens on a graph which does not mean too much to me. I would much rather listen to the sub in my own listening room and try to calibrate and integrate with the mains and room. The JL Audio has great features for doing this. Do we even know what excursions were taking place when this distortion was taking place?
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