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Dead drivers? |
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Ellwood 
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Joined: 26 February 2007 Location: United Kingdom Status: Offline Points: 18 |
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 Topic: Dead drivers?Posted: 12 June 2018 at 5:26pm |
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Would anyone know if a 15 studio colossus can be reconed to a 15xb spec? Basket is the same, magnet is the same, same pole diameter etc.. Just wondering if I can stick an Xb cone/voice coil in it ? Thanks in advance..
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John Ellwood Taylor
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re-production
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Joined: 16 February 2017 Location: Suffolk UK Status: Offline Points: 176 |
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Posted: 26 April 2018 at 5:58pm |
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So we opened up the cabs and the drivers were destroyed (surprise surprise). Both coils had gone and tears in the cone. However one basket had a crack in it, surely that couldn't have been done at the same time as the speakers being blown?
We are going to be running both subs stacked together in the centre of the room tonight rather than the L-R stacks we had last time so it should be easier on the drivers, we obviously also aren't going to be ragging them as hard. I will update with pics shortly
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Sirius Sounds
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Posted: 26 April 2018 at 4:34pm |
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With ample amplifier headroom there is no need to clip anything. Decent RMS limiting at the source and clip limiting on the LMS should make it safe to leave unattended. The dynamics of the source obviously makes a huge difference. I'm talking about DJs.
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Earplug
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Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Posted: 26 April 2018 at 3:51pm |
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All this depends on the dynamics of the source and whether the drivers are given time to 'relax' and recover. Highly compressed muzak, played near to clip levels, in a cab without decent ventilation is recipe for desaster. Like taking too little equipment for the venue and then having to run at the limits. Then the speakers slowly going quieter and quieter is a red light - obvious overheating and/or power compression going on.  |
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Earplugs Are For Wimps!
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Conanski
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Joined: 26 January 2006 Location: Ottawa, Canada Status: Offline Points: 2543 |
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Posted: 26 April 2018 at 12:28am |
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bee
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Posted: 25 April 2018 at 10:33pm |
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if you run drivers to were your lms is limiting all night, then your setting up the system wrongly... and it would be very easy to cook drivers.
two quickest ways to blow drivers, underpowering them, Basically too a small amp, so amp is in clip on riding clip all night. 2nd is too much power, I would allways advise an amp to have 1/3 more output than the driver specced, and use gains on lms to get power needed. why not turn down your output gain on lms, to the point you need, then set limiter 2 db higher. keeping drivers within there safe limit. When I engineer my rig I don't use any type of limiters, some times ill take an av2 if I no the dj's are gonna redline. and run this between dj mixer and my live mixing desk. I never leave the desk or venue, and if I do walk away from desk, ill have a crew member to take over. Edited by bee - 25 April 2018 at 10:35pm |
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https://www.elements-audio.com
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BJtheDJ
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Posted: 25 April 2018 at 6:48pm |
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But nowhere on that page does it say "turn it all the way up all of the time" or anything remotely like that. What is does say is What is "Signal Burn"? Signal burn is a failure mode where the voice coil is burnt across its entire width, indicating uniform voice coil travel with respect to the stationary magnet structure. Such a burn pattern is not indicative of amplifier malfunction but instead is due to excessive signal or program level. The cause is simply trying to get more from the speaker than it is capable of delivering Edited by BJtheDJ - 25 April 2018 at 6:48pm |
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It's a difficult choice, would you rather have:
A: A vegan son. B: An OnlyFans daughter |
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SamV
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Posted: 25 April 2018 at 6:11pm |
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The drivers out the box and test them on the meter and then connected to another amp if ok.
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Sirius Sounds
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Posted: 25 April 2018 at 4:45pm |
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I go by the JBL advice of more amplifier headroom resultingrin a cleaner signal and less problems:
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Conanski
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Posted: 25 April 2018 at 2:40pm |
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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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toastyghost
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Posted: 25 April 2018 at 12:59pm |
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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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fatfreddiescat
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Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1083 |
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Posted: 25 April 2018 at 8:42am |
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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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Conanski wrote: