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First damage. B&C DE500

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mirenkoo View Drop Down
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    Posted: 13 February 2016 at 10:09am
After few years of running this lovely system first damage occurred. Xtro settings set as in plan.
Any idea why this happened? Amplifier used QSC RMX850.



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VECTORDJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote VECTORDJ Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2016 at 12:47pm
Too much stress. Feedback??  Amp turning on/off thumping?? Do you use a cap ( 10 - 20 mfd) between the amp and driver??  VECTORSONICS
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve20131 Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2016 at 6:18pm
Coils not burnt.  Looks like metal fatigue/old age?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sn95 Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2016 at 10:04pm
Originally posted by Steve20131 Steve20131 wrote:

Coils not burnt.  Looks like metal fatigue/old age?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MattStolton Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2016 at 10:20pm
I have had this reoccuring on some Tannoy V15i cabs. They are run passive, but part of a active 2 way FOH.

DSP is set exactly as per settings in manual, and has look ahead limiters, and huge amount of limited headroom on amps. My opinion is low res mp3, rich in unnatural harmonics, creating square waves at HF.

Either that, or the Tannoy designed and built X-over's are crossing at too low a frequency, or at too low a rate per octave.

I would expect similar from these identically failed diaphragms.
Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains"
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mirenkoo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mirenkoo Quote  Post ReplyReply Direct Link To This Post Posted: 08 August 2016 at 9:55pm
Coil is absolutely fine. Maybe switching off other equipment first instead of amplifiers? Not expensive repair, but still... Speaker is 5 years old. 
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mirenkoo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mirenkoo Quote  Post ReplyReply Direct Link To This Post Posted: 08 August 2016 at 9:57pm
Possible equipment switching on/off before amps. And no, no cap used between. Ill probably add them.
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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: 08 August 2016 at 10:40pm
This damage is typical for a diaphragm that ran too low a frequency.
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mirenkoo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mirenkoo Quote  Post ReplyReply Direct Link To This Post Posted: 09 August 2016 at 12:15pm
Even when crossed at 2500Hz? Using DCX2496.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 09 August 2016 at 1:24pm
Maybe, what slope?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shaun1264 Quote  Post ReplyReply Direct Link To This Post Posted: 09 August 2016 at 6:50pm
Some amps chuck out some DC when switching off.   Crackle and pop are some of the sounds.
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Teunos View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Teunos Quote  Post ReplyReply Direct Link To This Post Posted: 09 August 2016 at 7:30pm
Which is exactly why i run all of my HF drivers behind a very big (Fc at least an octave below intended Xover frequency) MKP capacitor.
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Teun.

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