Constuction Help - Booming powered speaker

kurtbauer · 9th July 2007, 04:09 PM

Hello Everyone,

I have tried my hand at rebuilding a pair of Infinity Overture 1, powered speakers that I ended up with. I cleaned up the amp boards, replaced some crossover parts and put things back together.

The result is that they work but sound really boomy and I'm wondering if it might be due to my (re)construction. I tried to seal all of the drivers and such and I replaced the 1" sheet of sound absorbing material with the loose kind used to stuff pillows. It's pretty stuffed in there.

Any ideas? I'm totally new to loudspeaker construction.

Thanks,
Kurt

sreten · 9th July 2007, 05:21 PM

Hi, stupid question but have you tried adjusting the boom knob ?

/sreten.

kurtbauer · 9th July 2007, 05:36 PM

There is a "Bass" knob (which should be labeled "Boom") that I have set to its minimum setting and it's still boomy.

sreten · 9th July 2007, 07:05 PM

Hi,

some crossover parts could be wrong, leaving bass excessive ........
What were they like before you rebuilt them ?

/sreten.

kurtbauer · 10th July 2007, 03:02 PM

The crossover changes were on one side only and the inductor and the resistor match the schematic and the the good side.

The one speaker that worked beforehand wasn't boomy like they are now.

Both sides sound the same which leads me to my construction technique.

GM · 10th July 2007, 04:06 PM

Assuming by '1" sheet of sound absorbing material' you mean acoustic fiberglass, then its absorption co-efficient is considerably > polyfil or similar, so try adding more. Also, some OEM speakers I've seen are poorly constructed/lossy by design to 'kill a flock of birds' with one 'bullet', so your sealing them may indeed have increased their 'boominess'.

sreten · 10th July 2007, 05:24 PM

Hi,

If you've really stuffed them its possible to overdo it, could cause boom.

I suggest playing around with one leaving the other as a control until you find the cause.

/sreten.

kurtbauer · 10th July 2007, 05:27 PM

I haven't messed with speaker construction before so I'm at a loss on what to even look for. As you suggest, I'll depopulate the stuffing and compare.

Is the idea that the filling (or whatever you call it) is in there loosely?

Thanks for you help.

Kurt

GM · 10th July 2007, 09:11 PM

Typically you stuff based on weight of stuffing Vs volume, i.e. lbs/ft^3, etc.. Maybe this will help: http://web.archive.org/web/200210070...ces/fiberfill/

Cal Weldon · 10th July 2007, 09:37 PM

Quote:

Originally posted by sreten
If you've really stuffed them its possible to overdo it, could cause boom.

? pray tell

9th July 2007, 04:09 PM	#1
kurtbauer diyAudio Member Join Date: Dec 2006	Constuction Help - Booming powered speaker Hello Everyone, I have tried my hand at rebuilding a pair of Infinity Overture 1, powered speakers that I ended up with. I cleaned up the amp boards, replaced some crossover parts and put things back together. The result is that they work but sound really boomy and I'm wondering if it might be due to my (re)construction. I tried to seal all of the drivers and such and I replaced the 1" sheet of sound absorbing material with the loose kind used to stuff pillows. It's pretty stuffed in there. Any ideas? I'm totally new to loudspeaker construction. Thanks, Kurt

9th July 2007, 05:36 PM	#3
kurtbauer diyAudio Member Join Date: Dec 2006	Think so... There is a "Bass" knob (which should be labeled "Boom") that I have set to its minimum setting and it's still boomy.

10th July 2007, 03:02 PM	#5
kurtbauer diyAudio Member Join Date: Dec 2006	Xover changes were on one side. The crossover changes were on one side only and the inductor and the resistor match the schematic and the the good side. The one speaker that worked beforehand wasn't boomy like they are now. Both sides sound the same which leads me to my construction technique.

10th July 2007, 04:06 PM	#6
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Assuming by '1" sheet of sound absorbing material' you mean acoustic fiberglass, then its absorption co-efficient is considerably > polyfil or similar, so try adding more. Also, some OEM speakers I've seen are poorly constructed/lossy by design to 'kill a flock of birds' with one 'bullet', so your sealing them may indeed have increased their 'boominess'. __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

10th July 2007, 05:27 PM	#8
kurtbauer diyAudio Member Join Date: Dec 2006	I'll try that I haven't messed with speaker construction before so I'm at a loss on what to even look for. As you suggest, I'll depopulate the stuffing and compare. Is the idea that the filling (or whatever you call it) is in there loosely? Thanks for you help. Kurt


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9th July 2007, 05:21 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, stupid question but have you tried adjusting the boom knob ? /sreten.

9th July 2007, 07:05 PM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, some crossover parts could be wrong, leaving bass excessive ........ What were they like before you rebuilt them ? /sreten.

10th July 2007, 05:24 PM	#7
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, If you've really stuffed them its possible to overdo it, could cause boom. I suggest playing around with one leaving the other as a control until you find the cause. /sreten.

10th July 2007, 09:11 PM	#9
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Typically you stuff based on weight of stuffing Vs volume, i.e. lbs/ft^3, etc.. Maybe this will help: http://web.archive.org/web/200210070...ces/fiberfill/ __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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