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Old 14th February 2009, 07:32 PM   #1
tnsguy is offline tnsguy  United States
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Default Heat Induced Pressure in Cabinet?

I am new to speaker building, so this question may be laughable, but it is stuck in my brain. If I build a sealed enclosure loudspeaker and do a good job of sealing everything, will the temperature rise inside the enclosure during use of the finished speaker give rise to a pressure increase (PV=nRT) that will displace the nominal position of diaphrams of the drivers? If this happened, I would imagine it would cause distortion. Or is it that no speaker is sealed that well?

Thanks for listening.

Tom
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Old 14th February 2009, 08:12 PM   #2
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Any such change... and it does occur, is likely dwarfed by the day-to-day changes in barometric pressue.

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Old 14th February 2009, 08:13 PM   #3
albin is offline albin  United Kingdom
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Default yes and no

hello
Lovely question.Inefficent speakers make heat into the box,the air expands,the diaphragms move out,inescapable.You gots to have a leak,but it only needs to be slow.It's been recognized before.
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Old 14th February 2009, 10:03 PM   #4
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Default Re: Heat Induced Pressure in Cabinet?

Quote:
Originally posted by tnsguy
I am new to speaker building, so this question may be laughable, but it is stuck in my brain. If I build a sealed enclosure loudspeaker and do a good job of sealing everything, will the temperature rise inside the enclosure during use of the finished speaker give rise to a pressure increase (PV=nRT) that will displace the nominal position of diaphrams of the drivers? If this happened, I would imagine it would cause distortion. Or is it that no speaker is sealed that well?

Thanks for listening.

Tom

You shouldnt be making a completely sealed enclosure.
Drill a very small hole in the enclosure to equalise the inside and outside pressure. A small hole wont affect normal running of the speaker. Just an 1/8th of an inch hole would do.
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Old 14th February 2009, 11:50 PM   #5
tnsguy is offline tnsguy  United States
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Default Re: Heat Induced Pressure in Cabinet?

Thank you all for the replys. It makes perfect sense. My mind is at ease........

Tom
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Old 15th February 2009, 01:42 AM   #6
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Most speakers have a very small leak through the spider and voice coil gap.(edit-Thinking vented pole-pieces here)Sometimes even the (foam) surround can leak a tiny bit.
I'd seal the box up the best I could,and not worry about it -no drilling small holes or anything.
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Old 15th February 2009, 01:46 AM   #7
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Quote:
Originally posted by DigitalJunkie
Most speakers have a very small leak through the spider and voice coil gap.(edit-Thinking vented pole-pieces here)Sometimes even the (foam) surround can leak a tiny bit.
I'd seal the box up the best I could,and not worry about it -no drilling small holes or anything.

I use jack sockets on my speaker cabinets and they have quite a large hole in them anyway.
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Old 15th February 2009, 02:40 AM   #8
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Exactly. There are enough small,slow leaks (or in your case,larger leaks) in a speaker cabinet to not worry about it.
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