Ringing in Philips 9710

Gregje · 5th June 2011, 08:00 AM

Hi,

I am using Philips 9710 in an tqwt enclosure.
I have noticed that one driver produces sometimes a high pitch ringing.
This happens usually when playing sopranos (in loud passges) or some guitar notes.
This does not happen when played quietly. Still annoying when you want to turn up the volume a bit to get more like life like performance.

It is still there when I take the driver out of the enclosure.

Is the spreaker fried? I guess there is nothing I can do?

Any hints will be appreciated.

Greg

Zen Mod · 08:42 AM

if Rdc is comparable with other driver - VC is probably fine , and then all you need is to realign it .

find good speaker repair shop , for them it's piece of cake

in any case - only after complete disassembling is possible to be sure

Gregje · 5th June 2011, 09:52 AM

Hi,

Yes, Rdc seems to be ok.
Thanks for the advice.

Greg

Gregje · 7th June 2011, 12:50 PM

I googled around to find a good workshop in the UK (preferably London).
I can't find anything.
Any clues, good/bad experience?

DrBoar · 8th June 2011, 01:49 PM

Try first to figure out what the reason is.
If you swap positions for left and right speaker. Does the ringing follow the driver?
No= room accoustics
Yes= try swapping amplifer chanels without moving speakers. Does the ringing change with swapping?
No= Driver problem
Yes= amp problem

If driver problem is it coil or cone.
Try putting a doughnut of cotton or some other BAF or soft foam betwwen the inner cone and the main cone. Production tolerances can cause several resonances to coincide in one driver but not others, if you are out of luck.

Scraping voicecoil can be detetected by playing something like the 0-200 Hz test tone ( download from the net) and playing at a low volume with the driver out of the box. Out of the box the ideal driver would not make any noise at all just vibrate wih very little extra sounds being emitted.

Realigning a cone with paper suspension without reconing it?
I would look out for 9710 in flea markets and Ebay. I got a pair on a flea market for about 20 euros, in Voigt pipes facing forward and sounding quite terrible. The driver is made for facing upwards not towards the listerner

Gregje · 10th June 2011, 08:11 PM

Hi,

I tried the speakers with a different amp.
The problem is still there. Also when I took out the drivers from the enclosure.
Still have to try teh damping between the cone and the whizzer as you suggested.

Gregje · 14th June 2011, 08:56 PM

Hi,

I have tested the driver with the tone generator. It resonates at 1370-1420Hz.
Is this the voice coil then?

5th June 2011, 08:00 AM	#1
Gregje diyAudio Member Join Date: Oct 2009	Ringing in Philips 9710 Hi, I am using Philips 9710 in an tqwt enclosure. I have noticed that one driver produces sometimes a high pitch ringing. This happens usually when playing sopranos (in loud passges) or some guitar notes. This does not happen when played quietly. Still annoying when you want to turn up the volume a bit to get more like life like performance. It is still there when I take the driver out of the enclosure. Is the spreaker fried? I guess there is nothing I can do? Any hints will be appreciated. Greg

5th June 2011, 08:40 AM	#2
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	if Rdc is comparable with other driver - VC is probably fine , and then all you need is to realign it . find good speaker repair shop , for them it's piece of cake in any case - only after complete disassembling is possible to be sure __________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; BAF Forum & Gallery;I'm dumb Last edited by Zen Mod; 5th June 2011 at 08:42 AM.

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5th June 2011, 09:52 AM	#3
Gregje diyAudio Member Join Date: Oct 2009	Hi, Yes, Rdc seems to be ok. Thanks for the advice. Greg

7th June 2011, 12:50 PM	#4
Gregje diyAudio Member Join Date: Oct 2009	I googled around to find a good workshop in the UK (preferably London). I can't find anything. Any clues, good/bad experience?

8th June 2011, 01:49 PM	#5
DrBoar diyAudio Member Join Date: Apr 2003 Location: Stockholm	Try first to figure out what the reason is. If you swap positions for left and right speaker. Does the ringing follow the driver? No= room accoustics Yes= try swapping amplifer chanels without moving speakers. Does the ringing change with swapping? No= Driver problem Yes= amp problem If driver problem is it coil or cone. Try putting a doughnut of cotton or some other BAF or soft foam betwwen the inner cone and the main cone. Production tolerances can cause several resonances to coincide in one driver but not others, if you are out of luck. Scraping voicecoil can be detetected by playing something like the 0-200 Hz test tone ( download from the net) and playing at a low volume with the driver out of the box. Out of the box the ideal driver would not make any noise at all just vibrate wih very little extra sounds being emitted. Realigning a cone with paper suspension without reconing it? I would look out for 9710 in flea markets and Ebay. I got a pair on a flea market for about 20 euros, in Voigt pipes facing forward and sounding quite terrible. The driver is made for facing upwards not towards the listerner

10th June 2011, 08:11 PM	#6
Gregje diyAudio Member Join Date: Oct 2009	Hi, I tried the speakers with a different amp. The problem is still there. Also when I took out the drivers from the enclosure. Still have to try teh damping between the cone and the whizzer as you suggested.

14th June 2011, 08:56 PM	#7
Gregje diyAudio Member Join Date: Oct 2009	Hi, I have tested the driver with the tone generator. It resonates at 1370-1420Hz. Is this the voice coil then?

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