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JL Audio M650-blown speaker

Old 05-18-2008, 02:46 PM
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Default JL Audio M650-blown speaker

Great speakers but just fried one of my two JL's. They made it just over the warranty period of 1 yr. Cone separated. Pushing without amp at 50w/channel.

Anyone else have trouble with the JL's blowing?
Old 05-19-2008, 04:57 AM
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Default Re: JL Audio M650-blown speaker

If you overpower any speaker, it will fail in one way or the other. If you turn your stereo up to the point of distortion, there's a good chance you will damage either the stereo or the speakers or both.

When installed on a boat, there is the added problem of water or moisture damage.
Old 05-19-2008, 09:08 AM
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Default Re: JL Audio M650-blown speaker

I would call them up and see what they say.
Old 05-19-2008, 09:17 AM
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Default Re: JL Audio M650-blown speaker

a speaker falling apart isnt the same as a blown speaker. unless it was being pushed past its mechanical limits, but I would expect the voice coil to melt before the cone seperated.

it seems like a quality control issue. i hope its not going to be a trend
Old 05-19-2008, 01:24 PM
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Default Re: JL Audio M650-blown speaker

I'm only pushing 50w/channel. The speakers are rated for 150 so I wouldn't say that I am overpowering them. One possibility is that with lower power ie. without an amp they tend to distort more at higher volume leading to earlier failure?? Either way they are the best sounding speakers I've owned but a 1yr warranty sucks for the price these things run.
Old 05-19-2008, 05:20 PM
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Default Re: JL Audio M650-blown speaker

as you allude to, sometimes less power can be worse than more. when an amplifier reaches its current output limit, the waveform goes from sinusoidal/flowing to flat at the top, refered to as clipping (because the waveform looks like someone clipped the top off). this is the most frequent way speakers are damaged.

certainly poor quality control on the adhesive process could cause it too i would give JL an opportunity to make good even slightly out of warranty
Old 05-19-2008, 05:41 PM
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Default Re: JL Audio M650-blown speaker

Great Advice given, wanted to mention that your factory radio may say 50watts a channel, but it is far from it. Turning the volume up may introduce 25-40 watts of distorted power which will cause more damage than 100 watt clean signal from an amplifier.

As I am not a JL audio dealer, I have read extensively and have a pair of 6.5 as well as 7.7 and 10 " subs, and have not heard of this happening. I would definitely have JL audio tech support have a look, as what you describe is not a "fried" speaker. Good luck

Nick
Old 05-20-2008, 07:20 AM
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Default Re: JL Audio M650-blown speaker


......................what you describe is not a "fried" speaker
That's not really much of a technical term anyway.
Old 05-21-2008, 09:49 AM
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Default Re: JL Audio M650-blown speaker

chainsaw42 - 5/19/2008 8:20 PM
as you allude to, sometimes less power can be worse than more. when an amplifier reaches its current output limit, the waveform goes from sinusoidal/flowing to flat at the top, refered to as clipping (because the waveform looks like someone clipped the top off). this is the most frequent way speakers are damaged.
Car audio guys (and salesmen) talk about this a lot, but I think it may just be urban legend. Since the speaker is a mechanical device it has a dampened response to whatever is sent to it anyway - not sure what the real world effects of driving a speaker with a square waveform would be, but I suspect it's just not that bad. After all, you could record a square waveform and send it to the speaker and no one would expect that to blow it up.

Have inadvertantly damaged some cheap and very expensive speakers before, but typically it was too much power that was the cause.

If the cone simply seperated from the surround it can be re-glued. Agreed about the price for these things and expectations - please call let us know what the factory says, would be nice to hear that they'll stand behind them.
Old 05-21-2008, 06:04 PM
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Default Re: JL Audio M650-blown speaker

Flot - 5/21/2008 12:49 PM

chainsaw42 - 5/19/2008 8:20 PM
as you allude to, sometimes less power can be worse than more. when an amplifier reaches its current output limit, the waveform goes from sinusoidal/flowing to flat at the top, refered to as clipping (because the waveform looks like someone clipped the top off). this is the most frequent way speakers are damaged.
Car audio guys (and salesmen) talk about this a lot, but I think it may just be urban legend. Since the speaker is a mechanical device it has a dampened response to whatever is sent to it anyway - not sure what the real world effects of driving a speaker with a square waveform would be, but I suspect it's just not that bad. After all, you could record a square waveform and send it to the speaker and no one would expect that to blow it up.

Have inadvertantly damaged some cheap and very expensive speakers before, but typically it was too much power that was the cause.
It's not "urban legend".

When you overdrive an amplifier to the point of extreme distortion, the output aproaches a square wave. This square wave contains some very high frequencies that are not part of the original signal. If you have a speaker system with woofers and tweeters, the tweeters normally reproduce a small portion of the signal. Driving the amplifier to extreme distortion will produce a lot of high frequency power and often overload and burn out the tweeters.

This doesn't seem to be what happened in the OP's case. A very short extreme overload could damage the cone without burning out the voice coil, there could have been some physical damage, or it could have been poorly constructed in the first place.

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