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Old 4th June 2006, 04:04 AM   #1
caw is offline caw  Australia
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Default 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.
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Old 4th June 2006, 04:14 AM   #2
Bare is offline Bare  Canada
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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 :-)
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Old 4th June 2006, 07:07 AM   #3
dfdye is offline dfdye  United States
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Yea, I'll second the clipping hypothesis. Do you have a scope to look at the output? That should tell you definitively.
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Old 4th June 2006, 02:20 PM   #4
poobah is offline poobah  United States
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Try turning down the volume...
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Old 4th June 2006, 02:29 PM   #5
quasi is offline quasi  Australia
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Poobah,

I'm starting to enjoy your well researched and very detailed analysis of audio issues.
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Old 4th June 2006, 02:31 PM   #6
quasi is offline quasi  Australia
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What do you mean the DC offset is 1/10th of dvc ?
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Old 4th June 2006, 02:40 PM   #7
poobah is offline poobah  United States
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Sorry Quasi,

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

Where's my chicken?
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Old 4th June 2006, 02:57 PM   #8
poobah is offline poobah  United States
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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!


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Old 4th June 2006, 07:49 PM   #9
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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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Old 4th June 2006, 07:56 PM   #10
poobah is offline poobah  United States
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caw... one more question... are your amps bridged into pairs?

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

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