Tempest vented EBS subwoofer - Page 2

BrianGT · 20th October 2002, 02:23 AM

I admit.. I didn't fully realize how big it was going to be... this picture shows how it dwarfs the room...

--
Brian

planet10 · 20th October 2002, 03:31 AM

Quote:

Originally posted by BrianGT
The braces are directly down the middle.

The brace is a good idea, and you did run it the long way (a good thing), unfortuneatly right down the middle is the worst place to put it. It does little to brace against the 1st harmonic of the unbraced panel resonance or its harmonics. Because it clamps a zero-crossing it can actually raise the Q of these resonances. Best is to have braces divide a panel into 2 irregular trapezoids or if that is too much work at least 2 unequal rectangles. Hopefully the picture gets the idea across.

dave

fcel · 20th October 2002, 05:32 AM

Brian,
That is a humongous subwoofer. Haven't you heard of Carver's subwoofer? ... just kidding.

BrianGT · 20th October 2002, 01:34 PM

Dave,

I didn't even consider that. I just followed Adire Audio's cabinet design which divides it into quarters with the brace. The braces have holes in them so it is not exactly a full division, so I didn't consider it. It makes sense now how this might cause problems.

A lot of Adire Audio's applications have boxes cut into quarters with divisions making 4 equal square sections. If I build this again, I will consider this.

Where I got the design from:
http://www.adireaudio.com/Files/Vent...plications.PDF

Would dampening help eliminate this problem. I will be following their suggestion, putting 64oz of polyfil in the box. Is there anything else I can do?

fcel: the idea of too large didn't cross my mind until I actually assembled it. how big is carver's?

One more think.. This thing is very heavy.. made of an equivilant of almost 2 sheets of 4'x8' plywood

--
Brian

fcel · 20th October 2002, 01:44 PM

The smallest Carver's subwoofers enclosure is somthing like 10"x10"x10" with amp built into it and claimed to have very impressive spec ... and thus I make that comparison in relation to size of box. I have not heard any of Carver's sub though. Your Tempest Sub may walk all over the tiny sub ...

planet10 · 20th October 2002, 05:03 PM

Quote:

Originally posted by BrianGT
Is there anything else I can do?

Since it would be a retrofit, about the best you could do would be to triangulate the 8 panels with pieces of (nominal) 3/4" x 1 1/2" plywood or hardwood end-on. It won't eat up much volume and will discourage those two modes.

dave

herm · 20th October 2002, 05:04 PM

I was just wondering how much polyfil you ordered.

Is there going to be a shortage on the east coast
because of you?

Thanks for the pics. Seeing someone else's work always
motivates me to get going on my own ...

P.S. Have you run any calcs like Linkwitz did for his Thor
to get an idea how much amp you need? I'll bet with your
box size and vents, you can drive it to Xmax at 20hz for
less than 200 watts...

BrianGT · 20th October 2002, 05:05 PM

Good idea, I will see if I can get access to a table saw next week. Thanks for the advice.

--
Brian

jleaman · 20th October 2002, 05:25 PM

id hate to be the one that has to help you move that thing around the house when the wife rearanges the ferniture every weeK LOL....

how much was your 15" tempest sub..

im looking at buying 2 10" subs if i can sell my 15" usd sub.

BrianGT · 20th October 2002, 06:15 PM

The box will take 64oz of polyfil (4 lbs) I ordered a 5lb bag of it.

I haven't run calculations for the power needed for the speakers yet. They seem to go plenty loud with the Leach amp, so my Aleph 2s will be good when I finish them for it.

As goes the wife... I have no wife so there is no problem.

I have more pics on my website:

http://brian.darg.net under the amplifier stuff part

--
Brian

20th October 2002, 05:04 PM	#17
herm diyAudio Member Join Date: Mar 2002 Location: Pasadena, CA USA	I am waiting for the polyfil that I ordered... I was just wondering how much polyfil you ordered. Is there going to be a shortage on the east coast because of you? Thanks for the pics. Seeing someone else's work always motivates me to get going on my own ... P.S. Have you run any calcs like Linkwitz did for his Thor to get an idea how much amp you need? I'll bet with your box size and vents, you can drive it to Xmax at 20hz for less than 200 watts...

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20th October 2002, 05:32 AM	#13
fcel diyAudio Member Join Date: Sep 2001 Location: LA County	Brian, That is a humongous subwoofer. Haven't you heard of Carver's subwoofer? ... just kidding.

20th October 2002, 01:34 PM	#14
BrianGT diyAudio Moderator Emeritus Join Date: Jan 2002 Location: near Atlanta, GA	Dave, I didn't even consider that. I just followed Adire Audio's cabinet design which divides it into quarters with the brace. The braces have holes in them so it is not exactly a full division, so I didn't consider it. It makes sense now how this might cause problems. A lot of Adire Audio's applications have boxes cut into quarters with divisions making 4 equal square sections. If I build this again, I will consider this. Where I got the design from: http://www.adireaudio.com/Files/Vent...plications.PDF Would dampening help eliminate this problem. I will be following their suggestion, putting 64oz of polyfil in the box. Is there anything else I can do? fcel: the idea of too large didn't cross my mind until I actually assembled it. how big is carver's? One more think.. This thing is very heavy.. made of an equivilant of almost 2 sheets of 4'x8' plywood -- Brian

20th October 2002, 01:44 PM	#15
fcel diyAudio Member Join Date: Sep 2001 Location: LA County	The smallest Carver's subwoofers enclosure is somthing like 10"x10"x10" with amp built into it and claimed to have very impressive spec ... and thus I make that comparison in relation to size of box. I have not heard any of Carver's sub though. Your Tempest Sub may walk all over the tiny sub ...

20th October 2002, 05:05 PM	#18
BrianGT diyAudio Moderator Emeritus Join Date: Jan 2002 Location: near Atlanta, GA	Good idea, I will see if I can get access to a table saw next week. Thanks for the advice. -- Brian

20th October 2002, 05:25 PM	#19
jleaman Banned Join Date: Apr 2002	id hate to be the one that has to help you move that thing around the house when the wife rearanges the ferniture every weeK LOL.... how much was your 15" tempest sub.. im looking at buying 2 10" subs if i can sell my 15" usd sub.

20th October 2002, 06:15 PM	#20
BrianGT diyAudio Moderator Emeritus Join Date: Jan 2002 Location: near Atlanta, GA	The box will take 64oz of polyfil (4 lbs) I ordered a 5lb bag of it. I haven't run calculations for the power needed for the speakers yet. They seem to go plenty loud with the Leach amp, so my Aleph 2s will be good when I finish them for it. As goes the wife... I have no wife so there is no problem. I have more pics on my website: http://brian.darg.net under the amplifier stuff part -- Brian