First damage. B&C DE500 |
Post Reply | Page 12> |
Author | |
mirenkoo
Registered User Joined: 25 December 2008 Location: Stoke-on-Trent Status: Offline Points: 43 |
Post Options
Thanks(0)
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. |
|
VECTORDJ
Young Croc Joined: 11 June 2006 Location: United States Status: Offline Points: 515 |
Post Options
Thanks(0)
|
Too much stress. Feedback?? Amp turning on/off thumping?? Do you use a cap ( 10 - 20 mfd) between the amp and driver?? VECTORSONICS
|
|
Steve20131
Registered User Joined: 28 July 2013 Location: Northants Status: Offline Points: 411 |
Post Options
Thanks(0)
|
Coils not burnt. Looks like metal fatigue/old age?
|
|
sn95
Registered User Joined: 10 March 2013 Location: USA Status: Offline Points: 351 |
Post Options
Thanks(0)
|
|
|
MattStolton
Old Croc Joined: 04 September 2010 Location: Walthamstow Status: Offline Points: 4234 |
Post Options
Thanks(0)
|
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" |
|
mirenkoo
Registered User Joined: 25 December 2008 Location: Stoke-on-Trent Status: Offline Points: 43 |
Post Options
Thanks(0)
|
Coil is absolutely fine. Maybe switching off other equipment first instead of amplifiers? Not expensive repair, but still... Speaker is 5 years old.
|
|
mirenkoo
Registered User Joined: 25 December 2008 Location: Stoke-on-Trent Status: Offline Points: 43 |
Post Options
Thanks(0)
|
Possible equipment switching on/off before amps. And no, no cap used between. Ill probably add them.
|
|
Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
Post Options
Thanks(0)
|
This damage is typical for a diaphragm that ran too low a frequency.
|
|
mirenkoo
Registered User Joined: 25 December 2008 Location: Stoke-on-Trent Status: Offline Points: 43 |
Post Options
Thanks(0)
|
Even when crossed at 2500Hz? Using DCX2496.
|
|
odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5482 |
Post Options
Thanks(0)
|
Maybe, what slope?
|
|
shaun1264
Registered User Joined: 06 September 2013 Location: Surrey Status: Offline Points: 292 |
Post Options
Thanks(0)
|
Some amps chuck out some DC when switching off. Crackle and pop are some of the sounds.
|
|
Teunos
Old Croc Joined: 23 November 2008 Location: The Netherlands Status: Offline Points: 1799 |
Post Options
Thanks(0)
|
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.
|
|
Best regards,
Teun. |
|
Post Reply | Page 12> |
Tweet |
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |