woofer popping sound when driven hard

caw · 4th June 2006, 04:04 AM

Hi ,i am wondering if any-body can shed some light on a problem i am having . The woofers make a popping sound when driven very hard. The woofer excursions dont seem to be excessive.It isnt motorboating, the dc offset is less than 1/10th dcv on the amps.The sound comes through on all the woofers.The amps dont appear to be clipping.Only happens when there is heavy transiant bass played very load.
The system is the Linkwitz Orion speaker system driven by 4x Marchand PM 21 amps (LM 3886 chip amp ) with 2x Marchand PS11 PS.I have tried two pre-amps with no change to the problem.
Any ideas greatly appreciated.
Thanks caw.

Bare · 4th June 2006, 04:14 AM

I think yer Amps ARE clipping or your driver's voice coils are bottoming. Easy test try with another Amp.,, but don't wait too long or you may be buying new drivers as well as new amplification :-)

dfdye · 4th June 2006, 07:07 AM

Yea, I'll second the clipping hypothesis. Do you have a scope to look at the output? That should tell you definitively.

poobah · 4th June 2006, 02:20 PM

Try turning down the volume...

quasi · 4th June 2006, 02:29 PM

Poobah,

I'm starting to enjoy your well researched and very detailed analysis of audio issues.

quasi · 4th June 2006, 02:31 PM

What do you mean the DC offset is 1/10th of dvc ?

poobah · 4th June 2006, 02:40 PM

Sorry Quasi,

When I saw caw's "handle"... I couldn't resist.

Where's my chicken?

poobah · 4th June 2006, 02:57 PM

caw,

The amps are 65 Watts each. (x 4 = 260 Watts )

The power supplies are 80 Watts each (x 2 = 160 Watts)

You are running out of gas! Most likely the sound you are hearing is the over-current protection on the power supply kicking in. Call Marchand. Likely you need close to 400-500 Watts of
supply for these amps.

Look here

Happy now Quasi?

Oh, and caw, my signature line below has been that way for months, no insult intended!

head_spaz · 4th June 2006, 07:49 PM

Check the surrounds on your woofers.
They're probably torn and abused allowing excessive cone travel.

poobah · 4th June 2006, 07:56 PM

caw... one more question... are your amps bridged into pairs?

That can have a big impact on you power requirements...

4th June 2006, 04:04 AM	#1
caw diyAudio Member Join Date: Jun 2005 Location: south coast nsw	woofer popping sound when driven hard Hi ,i am wondering if any-body can shed some light on a problem i am having . The woofers make a popping sound when driven very hard. The woofer excursions dont seem to be excessive.It isnt motorboating, the dc offset is less than 1/10th dcv on the amps.The sound comes through on all the woofers.The amps dont appear to be clipping.Only happens when there is heavy transiant bass played very load. The system is the Linkwitz Orion speaker system driven by 4x Marchand PM 21 amps (LM 3886 chip amp ) with 2x Marchand PS11 PS.I have tried two pre-amps with no change to the problem. Any ideas greatly appreciated. Thanks caw.

4th June 2006, 02:29 PM	#5
quasi diyAudio Member Join Date: Sep 2004 Location: Adelaide, Australia	Poobah, I'm starting to enjoy your well researched and very detailed analysis of audio issues. __________________ http://sites.google.com/site/quasisdiyaudiosite/

4th June 2006, 02:31 PM	#6
quasi diyAudio Member Join Date: Sep 2004 Location: Adelaide, Australia	What do you mean the DC offset is 1/10th of dvc ? __________________ http://sites.google.com/site/quasisdiyaudiosite/

4th June 2006, 07:49 PM	#9
head_spaz diyAudio Member Join Date: Mar 2004 Location: Arkansas	Check the surrounds on your woofers. They're probably torn and abused allowing excessive cone travel. __________________ Writing is good exercize for the texticles!

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4th June 2006, 04:14 AM	#2
Bare diyAudio Member Join Date: Dec 2001 Location: vancouver	I think yer Amps ARE clipping or your driver's voice coils are bottoming. Easy test try with another Amp.,, but don't wait too long or you may be buying new drivers as well as new amplification :-)

4th June 2006, 07:07 AM	#3
dfdye diyAudio Member Join Date: Dec 2005 Location: USA	Yea, I'll second the clipping hypothesis. Do you have a scope to look at the output? That should tell you definitively.

4th June 2006, 02:20 PM	#4
poobah diyAudio Member Join Date: Nov 2005	Try turning down the volume...

4th June 2006, 02:40 PM	#7
poobah diyAudio Member Join Date: Nov 2005	Sorry Quasi, When I saw caw's "handle"... I couldn't resist. Where's my chicken?

4th June 2006, 02:57 PM	#8
poobah diyAudio Member Join Date: Nov 2005	caw, The amps are 65 Watts each. (x 4 = 260 Watts ) The power supplies are 80 Watts each (x 2 = 160 Watts) You are running out of gas! Most likely the sound you are hearing is the over-current protection on the power supply kicking in. Call Marchand. Likely you need close to 400-500 Watts of supply for these amps. Look here Happy now Quasi? Oh, and caw, my signature line below has been that way for months, no insult intended!

4th June 2006, 07:56 PM	#10
poobah diyAudio Member Join Date: Nov 2005	caw... one more question... are your amps bridged into pairs? That can have a big impact on you power requirements...

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