First damage. B&C DE500 |
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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Posted: 10 August 2016 at 3:53pm |
B&C prices are a lot more reasonable now Blue Aran have taken over distribution. Proel were completely useless.
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studio45
Old Croc Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3863 |
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After "several" years, I would say you've probably just hit the MTBF (mean time between failures).
Titanium is nearly magic, but not quite. A certain amount of flexing, and consequent work-hardening of the material, is a normal part of operation - and when the hardness goes past a certain point, poof! Metal confetti. If you were shattering them every month, you would be doing something wrong. Once in several years is not really anything to worry about though. Apart from having to buy a new diaphragm at B+C prices of course ;)
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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That's entirely possible. More unusual on small compression drivers but seen it happen on large format ones where people have boosted them to try and produce frequencies they just can't do.
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fatfreddiescat
Young Croc Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1081 |
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To me that looks like it could be due to running high amounts of boost in the 8K plus region where the diaphragm is no longer working in piston mode, but is flexing. Often if the diaphragm has hit the bung hard, you can see the marks on the diaphagm
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Teunos
Old Croc Joined: 23 November 2008 Location: The Netherlands Status: Offline Points: 1799 |
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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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Best regards,
Teun. |
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shaun1264
Registered User Joined: 06 September 2013 Location: Surrey Status: Offline Points: 277 |
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Some amps chuck out some DC when switching off. Crackle and pop are some of the sounds.
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odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5483 |
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Maybe, what slope?
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mirenkoo
Registered User Joined: 25 December 2008 Location: Stoke-on-Trent Status: Offline Points: 43 |
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Even when crossed at 2500Hz? Using DCX2496.
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Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
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This damage is typical for a diaphragm that ran too low a frequency.
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mirenkoo
Registered User Joined: 25 December 2008 Location: Stoke-on-Trent Status: Offline Points: 43 |
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Possible equipment switching on/off before amps. And no, no cap used between. Ill probably add them.
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mirenkoo
Registered User Joined: 25 December 2008 Location: Stoke-on-Trent Status: Offline Points: 43 |
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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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MattStolton
Old Croc Joined: 04 September 2010 Location: Walthamstow Status: Offline Points: 4234 |
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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. |
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Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains" |
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