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Drivers blown but no noticeable burnt smell?

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Conanski View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Conanski Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2011 at 5:39pm
Originally posted by AC1 AC1 wrote:

They had 3 hours of non stop use before they blew?
Based on that statement alone I'd say they were pushing the system right up to just under clipping for those 3 hrs which got the voice coils nice and hot and then turned it up just a little more for a good song perhaps and they let go.
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Conanski View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Conanski Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2011 at 5:44pm
Originally posted by AC1 AC1 wrote:

Update,

Got back

opened them up.

Both completely seized

And there you have it.
 
The bottom line is these drivers aren't up to the task.. that being 500w of highly compressed recorded music for hours on end. For that you need drivers that have an RMS rating(not program) of at least 600w or more preferrably.
 
This is also the reason I will not dry rent or loan passive speakers anymore.. it's just too damn expensive.


Edited by Conanski - 28 June 2011 at 5:46pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AC1 Quote  Post ReplyReply Direct Link To This Post Posted: 29 June 2011 at 11:00am
the drivers had a rating of 600 watts rms?
Horns or reflex?
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Peter Jan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Peter Jan Quote  Post ReplyReply Direct Link To This Post Posted: 29 June 2011 at 1:00pm
Originally posted by AC1 AC1 wrote:

the drivers had a rating of 600 watts rms?

Do they REALLY ?
And besides, there's not that much difference between 500 and 600 Watts in terms of heating up a voice coil. If temperature in the venue (therefor also IN the speaker cabinet) was relatively high, the true capability of the speaker in terms of getting rid of heat, was maybe "only" 3-400 Watts in reality.
Just as Conanski said, it went seemingly 'allright' for some hours, the coils being warmed up to or over their thermal limit and than suddenly they gave way in a matter of seconds. Not so strange when you know a coils resistance rises with temperature, meaning less power and gradually pushing the faders to keep up the SPL. Windings expand, glue melts, coil former starts bubbling, windings get shorted or almost from rubbing in the magnetic gap (distortion), amps dumps bursts of everything he has in that near short-circuit (even more distortion), voicecoil fuses itself out at the weakest point, game over.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Conanski Quote  Post ReplyReply Direct Link To This Post Posted: 01 July 2011 at 6:46pm
Originally posted by AC1 AC1 wrote:

the drivers had a rating of 600 watts rms?
Are you sure or was that just the rating on the box? By rights the low frequency driver should have the same power rating as the cab but it's not uncommon to find drivers that are a fair bit less.. maybe only 300w-400w in retail products. And since you literally melted them with 500w this is all but confirmed.
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