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re-production View Drop Down
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Points: 176 		Post Options Post Options   Thanks (0) Thanks(0)   Quote re-production Quote  Post ReplyReply Direct Link To This Post Posted: 23 April 2018 at 7:13pm
So this would explain why the drivers slowly faded after 4 hours in a hot room? 
The long W bin design doesn't really let the drivers cool properly, we probably need to rethink trying to do gigs of two hundred people with just one bin a side.
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Originally posted by re-production re-production wrote:

So this would explain why the drivers slowly faded after 4 hours in a hot room? 
Yes.. they were being overpowered given the crest factor of the music they were being exposed to, so as Toasty described what's needed here is an RMS or thermal limiter to keep the long term average power levels in check.
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Originally posted by re-production re-production wrote:

The driver is rated at 1500w rms, 3000w AES
LOL.. No. There isn't a speaker voice coil in existence that can take 1500w RMS for any amount of time.. doesn't exist.

Originally posted by Hemisphere Hemisphere wrote:

It's rated 1500w AES, 3000w program according to that link.

Both you guys need to to study up on the AES spec.





Edited by Conanski - 24 April 2018 at 3:12am
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Originally posted by re-production re-production wrote:

So this would explain why the drivers slowly faded after 4 hours in a hot room? 
The long W bin design doesn't really let the drivers cool properly, we probably need to rethink trying to do gigs of two hundred people with just one bin a side.


That, and buy a multimeter :) Yes for that style of bin I think I'd want at least 2 per side, maybe 3. Rather run them cruising than flat out, and it gets your tops up to about the right height also.
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Originally posted by Conanski Conanski wrote:

Originally posted by re-production re-production wrote:

The driver is rated at 1500w rms, 3000w AES
LOL.. No. There isn't a speaker voice coil in existence that can take 1500w RMS for any amount of time.. doesn't exist.

Originally posted by Hemisphere Hemisphere wrote:

It's rated 1500w AES, 3000w program according to that link.

Both you guys need to to study up on the AES spec.




What's wrong with the given info by Hemisphere? It's still correct.
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Points: 397 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Xoc1 Quote  Post ReplyReply Direct Link To This Post Posted: 24 April 2018 at 8:24pm
Have you ever sat in front of a 1000w electric fire?
Get the average power anywhere near that and its easy to work out why that would burn out a voice coil.
Speakers are remarkably inefficient, nearly all the energy is turned into heat, not sound.
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Points: 10919 		Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 24 April 2018 at 9:55pm
Originally posted by Xoc1 Xoc1 wrote:

Have you ever sat in front of a 1000w electric fire?
Get the average power anywhere near that and its easy to work out why that would burn out a voice coil.
Speakers are remarkably inefficient, nearly all the energy is turned into heat, not sound.



http://eaw.com/docs/6_Technical_Information/StudyHall_and_TechNotes/Power_Handling.pdf

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Just to be clear when I said 1300w of house music should be fine with a 1500w AES driver, I meant 1300w as the OP indicated (1300w of amp power with clip limiters).
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Amps driven hard into the limiters ( limiters continuously on) in sealed chambers my guess would be around 250 - 300 Watts per driver is all it would take to cook them.

Edited by fatfreddiescat - 25 April 2018 at 8:42am
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Originally posted by Hemisphere Hemisphere wrote:

Just to be clear when I said 1300w of house music should be fine with a 1500w AES driver, I meant 1300w as the OP indicated (1300w of amp power with clip limiters).


And here lies the issue. What’s the voltage limit of the driver and cabinet combination? If it can’t use the extra voltage then it’s heating time.
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Points: 2537 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Conanski Quote  Post ReplyReply Direct Link To This Post Posted: 25 April 2018 at 2:40pm
Originally posted by Hemisphere Hemisphere wrote:

Just to be clear when I said 1300w of house music should be fine with a 1500w AES driver, I meant 1300w as the OP indicated (1300w of amp power with clip limiters).


It would be fine if the system was run where the limiters were only being tickled, but slam it into constant limiting as was surely the case and there is more than enough power available to cook drivers.

Something that has not been mentioned is exactly what was being used as the limiter, was it an analog comp/limiter or was it a digital device. Big difference between these, the analog device will continue to compress the signal as it is pushed harder so these really aren't suitable as a system limiter, while the digital device doesn't do this. Either way much better limiting is required for unsupervised rigs like this.
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Points: 54 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Sirius Sounds Quote  Post ReplyReply Direct Link To This Post Posted: 25 April 2018 at 4:45pm
I go by the JBL advice of more amplifier headroom resultingrin a cleaner signal and less problems: 
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