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
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
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.
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.
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'.
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/20021007....cyberglobe.net/caraudio/resources/fiberfill/
sreten said:If you've really stuffed them its possible to overdo it, could cause boom.
? pray tell
Cal Weldon said:
? pray tell
Hi,
I once filled a box with foam blocks where the open cells were too
dense. The effect was to reduce box volume, raising box F and Q.
/sreten.
if ported and booming bass....
try what I did with my daughter's 'el cheapo TEAC cdplayer/mp player thingy.. I used a Bill Perkins idea...stuffed the port with straws to make an "aperiodic" enclosure.
A couple of things happen:
1) boomy bass from a poorly built box is greatly reduced
2) the impedence load to the amplifier is greatly reduced, so the amp stays in control with greater power available at and near the tuned frequency of the sub.
So, if temporarily blocking the port helps, try stuffing it with straws, you'll be suprised at the results. It looks like hell but sounds incredibly good considering.
I would however, revert back to the factory dampening material if still available as well.
try what I did with my daughter's 'el cheapo TEAC cdplayer/mp player thingy.. I used a Bill Perkins idea...stuffed the port with straws to make an "aperiodic" enclosure.
A couple of things happen:
1) boomy bass from a poorly built box is greatly reduced
2) the impedence load to the amplifier is greatly reduced, so the amp stays in control with greater power available at and near the tuned frequency of the sub.
So, if temporarily blocking the port helps, try stuffing it with straws, you'll be suprised at the results. It looks like hell but sounds incredibly good considering.
I would however, revert back to the factory dampening material if still available as well.
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sreten said:I once filled a box with foam blocks where the open cells were too
dense. The effect was to reduce box volume, raising box F and Q.
I see. I was thinking you had used fiberglass or equivalent. Different story.
Cal Weldon said:
I see. I was thinking you had used fiberglass or equivalent. Different story.
Hi, I understand the same thing happens if you overstuff fibre, /sreten.
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