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Author Topic: Damping material over the crossover  (Read 3530 times)

Frank Povazanj

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Damping material over the crossover
« on: July 01, 2015, 08:54:41 PM »

I know that DIY speaker boxes are not very popular here, mostly for the good reasons. Still, I got some EAW cinema boxes while back and finally I got some time to convert them to monitors. They use 12inch coax B&C drivers and have a large crossover board. In the new boxes I reused the damping material from the original boxes and it is layed on top of the crossover board. Would this will be a problem? Boxes will mostly see light use in the rehearsal room in my home, for vocals or guitar modelers.

Attached is the photo of one of the monitors. Front grille not mounted yet.

Regards,
Frank
« Last Edit: July 01, 2015, 09:31:32 PM by Frank Povazanj »
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Ivan Beaver

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Re: Dumping material over the crossover
« Reply #1 on: July 01, 2015, 09:18:21 PM »

I know that DIY speaker boxes are not very popular here, mostly for the good reasons. Still, I got some EAW cinema boxes while back and finally I got some time to convert them to monitors. They use 12inch coax B&C drivers and have a large crossover board. In the new boxes I reused the dumping material from the original boxes and it is layed on top of the crossover board. Would this will be a problem? Boxes will mostly see light use in the rehearsal room in my home, for vocals or guitar modelers.

Atached is the photo of one of the monitors. Front grille not mounted yet.

Regards,
Frank
It is DAMPING -not dumping.

It depends on what all is on the crossover.  Some are pretty simple and do simply freq division, and some are very complex-doing crossover functions-eq etc.

Generally it is not a good idea to cover up parts that get hot.

Can you provide a photo of the crossover?

The harder you push the cabinet, the hotter the parts will get.  There is no "idle" heat in a passive crossover.
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Ivan Beaver
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Frank Povazanj

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Re: Dumping material over the crossover
« Reply #2 on: July 01, 2015, 09:38:57 PM »

It is DAMPING -not dumping.

...

Can you provide a photo of the crossover?


I added a photo of the crossover in the post above.
Corrected spelling too.
Thanks.
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Ivan Beaver

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Re: Dumping material over the crossover
« Reply #3 on: July 02, 2015, 07:44:09 AM »

I added a photo of the crossover in the post above.
Corrected spelling too.
Thanks.
That is a bit more than a basic crossover.

I would just suggest to mount the crossover on top of the damping material.
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Ivan Beaver
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Frank Povazanj

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Re: Dumping material over the crossover
« Reply #4 on: July 02, 2015, 01:16:26 PM »

That is a bit more than a basic crossover.

I would just suggest to mount the crossover on top of the damping material.

Yes the crossover is quite complex. I did not try to trace the schematic from it (probably would not understand most of it anyhow :) ). I am guessing it tries to flatten out the response as well.

I cannot raise the crossover higher because of the tight space inside (coax driver has the HD driver mounted on the back).

I think I will just rearrange the filling on the opposite sides of the box so they are not covering the crossover and port holes.

Regards,
Frank
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Scott Holtzman

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Re: Dumping material over the crossover
« Reply #5 on: July 02, 2015, 11:46:50 PM »

Yes the crossover is quite complex. I did not try to trace the schematic from it (probably would not understand most of it anyhow :) ). I am guessing it tries to flatten out the response as well.

I cannot raise the crossover higher because of the tight space inside (coax driver has the HD driver mounted on the back).

I think I will just rearrange the filling on the opposite sides of the box so they are not covering the crossover and port holes.

Regards,
Frank

It's damping material, not filing to take up space nor dampening, to make wet

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Scott AKA "Skyking" Holtzman

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Frank Povazanj

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Re: Dumping material over the crossover
« Reply #6 on: July 03, 2015, 09:00:09 AM »

It's damping material, not filing to take up space nor dampening, to make wet

I am not sure I understand this ... I thought filing would actually free some space since things would be better organized :) .
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Scott Holtzman

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Re: Damping material over the crossover
« Reply #7 on: July 03, 2015, 09:42:27 PM »

Filing is best utilized in a donut.  In physics when you dampen energy you are reducing energy.  In this case resonances within the enclosure.

Next weeks word will be phugoid.  Best demonstrated watching a woman try and operate a thermostat (ducking and running).

Happy 4th
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Scott AKA "Skyking" Holtzman

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Stephen Kirby

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Re: Damping material over the crossover
« Reply #8 on: July 04, 2015, 12:16:16 AM »

Crossovers (particularly the inductors) can get hot when run hard.  I've seen boxes where the input panel (which had the crossover mounted to it) was uncomfortable to touch.

The material inside a cabinet can serve one or both of two purposes.  It can damp internal reflections, in which case it is correctly called damping.  Or it can add apparent volume to the cabinet because it restricts air movement.  In which case it is sometimes referred to as stuffing.  Good box design software will take into account the amount of stuffing in calculating the resonant frequency of the air mass inside the cabinet.
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Scott Holtzman

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Re: Damping material over the crossover
« Reply #9 on: July 04, 2015, 05:59:11 AM »

Stuffing only has effect in sealed enclosures IIRC
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Scott AKA "Skyking" Holtzman

Ghost Audio Visual Solutions, LLC
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ProSoundWeb Community

Re: Damping material over the crossover
« Reply #9 on: July 04, 2015, 05:59:11 AM »


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