hd15 flutter

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   help....... 
took out a stack of 4 hd's on thursday and noticed an unnerving fluttering sound when the amps were up but signal from the mixer turned down.  it dissappeared when music was played, but when music was cut it was still there.  also they've started to sound less tight and more boomy, what do you think it could be? have i goosed them?

Edited by moss - 12 November 2005 at 7:13am

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moss Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 07 December 2004 Status: Offline Points: 144	Post Options Post Reply Quote moss Report Post Thanks(0) Quote Reply Topic: hd15 flutter Posted: 12 November 2005 at 7:12am
	help....... took out a stack of 4 hd's on thursday and noticed an unnerving fluttering sound when the amps were up but signal from the mixer turned down. it dissappeared when music was played, but when music was cut it was still there. also they've started to sound less tight and more boomy, what do you think it could be? have i goosed them? Edited by moss - 12 November 2005 at 7:13am

moss Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 07 December 2004 Status: Offline Points: 144	Post Options Post Reply Quote moss Report Post Thanks(0) Quote Reply Posted: 13 November 2005 at 9:23am
	anybody got any ideas????? i need to take them out again on wednesday..... all replies greatly appreciated!!!

ceharden Members Profile Send Private Message Find Members Posts Add to Buddy List The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11851	Post Options Post Reply Quote ceharden Report Post Thanks(0) Quote Reply Posted: 13 November 2005 at 11:07am
	Try them on some different amps, could be the amps rather than the speakers. Also give the drivers a good visual inspection,check the cones/surrounds are ok, nothing rubbing when you press down on the cone etc.

moss Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 07 December 2004 Status: Offline Points: 144	Post Options Post Reply Quote moss Report Post Thanks(0) Quote Reply Posted: 13 November 2005 at 12:28pm
	cheers!! ive had the backs off and the drivers seem to be ok. what could the problem be from the amps???? there relatively new and have been treated nicely.

JD01 Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 23 August 2004 Status: Offline Points: 819	Post Options Post Reply Quote JD01 Report Post Thanks(0) Quote Reply Posted: 13 November 2005 at 1:27pm
	This is not a problem of the HD15. I can't imagine what you mean by fluttering, but if the sound is present even when there is no signal, it can't be a problem of the speakers. Check if the problem stays wehn you turn down the amps (leave them turned on). If the sound stays (even with the volume knobs turned down fully) it is a problem of the amps. If it goes away, it is a problem of your mixer or your active crossover/digital controller.

moss Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 07 December 2004 Status: Offline Points: 144	Post Options Post Reply Quote moss Report Post Thanks(0) Quote Reply Posted: 13 November 2005 at 7:06pm
	cheers guys, i'll have a tinker and let you know how i get on...... @JD01 the fluttering sounds like a moth flapping about inside the cabinet. could notice it when the level of the mixer was turned right down but the amps were not. i'll check tomorrow, turning the amp down but not off. if the problem still persists and its the amp, would you hazard a guess at what the problem might be or what could of caused it? thanks again for your help all. Edited by moss - 13 November 2005 at 7:11pm

moss Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 07 December 2004 Status: Offline Points: 144	Post Options Post Reply Quote moss Report Post Thanks(0) Quote Reply Posted: 15 November 2005 at 6:51pm
	problem still persists..... not happy...... what could it be?????

Dixi Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 04 August 2005 Location: Sweden Status: Offline Points: 165	Post Options Post Reply Quote Dixi Report Post Thanks(0) Quote Reply Posted: 15 November 2005 at 8:43pm
	It could be a GND problem? Like the that gnd for the amps is not proper? Ive had that kidn of problem in houses and places were the electrical systems have bin half bad? try tapeing over the gns on the wallsocket and plug everything in could show if thats the problem?.. Dont know if you get what i mean my enlish might not explain very good but yeah... And ofcourse i mean if you run it on normal wallsocket power 110/230V? Not the full 380V stuff. Not smart to start messing around with thoose things :D //k Edited by Dixi - 15 November 2005 at 8:52pm
	"But where is the speaker? thats just a box with a hole in it!"

JD01 Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 23 August 2004 Status: Offline Points: 819	Post Options Post Reply Quote JD01 Report Post Thanks(0) Quote Reply Posted: 16 November 2005 at 10:01pm
	Do NOT isolate the GND. Can be dangerous! Try unplugging the imput signal connectors from the amps. So only amps on power with speakers attached, no crossover, no mixer. If it still is there, your amps have a fault. If it's gone, it's a wiring problem with your mixer/active crossover...

moss Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 07 December 2004 Status: Offline Points: 144	Post Options Post Reply Quote moss Report Post Thanks(0) Quote Reply Posted: 17 November 2005 at 6:39am
	again, thanks for your help...... i'll give these suggestions a try and see what happens..

Dixi Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 04 August 2005 Location: Sweden Status: Offline Points: 165	Post Options Post Reply Quote Dixi Report Post Thanks(0) Quote Reply Posted: 18 November 2005 at 9:16am
	"Do NOT isolate the GND. Can be dangerous!" I didnt tell him to run his system this way, but pluging in an amp and hook up a hd15 while not using gnd could show if thats the problem. "If it still is there, your amps have a fault" Not if the problem is in the electrical system were your trying out your system. But trying what JD01 said first would be they way to go. Let us know how its goes. Cheers!
	"But where is the speaker? thats just a box with a hole in it!"

JD01 Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 23 August 2004 Status: Offline Points: 819	Post Options Post Reply Quote JD01 Report Post Thanks(0) Quote Reply Posted: 19 November 2005 at 3:14pm
	I never heard of problems with the elctrical system that results in such problems only by plugging the amp to the mains. The problems always start, when mixer, crossover etc. are connected to the amp. And at this point it makes no difference if you isolate the mains GND on the amp (which can be very dangerous, especially if the amp itself HAS a problem causing the fluttering) or if you isolate the GND on the XLR input cables. Anyways, you didn't state that isolating the mains GND is an inapropriate way to use amps. One MIGHT try it as a last resort (if one is carefull --> no amp touching! and better even don't touch anything that is GND-connected with the amp while it's running), but only for a test. This is not to put you (Dixi) down, but to inform other people reading this thread.