Tempest X-2 in 8 cu.ft. sealed box

gwilliams20 · 8th June 2010, 04:12 PM

Folks, I would appreciate some input on this set up, please.

I have two 15" Tempest X-2 woofers. I intend to fit them to an eight cu.ft. sealed box comparable to the box for the vented Focal 15" Audiom without the vent. The box plans are on the Zalytron site. Look under Home Theater and then click on the Orca link. The plans are at the bottom of the page.

This combination appears pretty straight forward and simple. No filters, no equalization and good response. They (the woofers) will be used with the Aria 6 (for the center and surrounds) also on the Zalytron site and should crossover well at 80hz.

Any thoughts on improving this setup such as size, bracing, dimensions or location of the driver?

I have signed and notarized permission to build these.

All opinions welcomed. Thanks

jaekfre · 8th June 2010, 05:45 PM

This would definitely work. It's hard to go wrong with a sealed box.

Not knowing your goals of this project makes it hard to advise though. The Unibox spreadsheet is showing a 4ft^3 enclosure with both drivers only 3db lower at 20hz and about 1.25db lower at 30hz compared to the 8ft^3 enclosure. It may be beneficial to look into different enclosure sizes to see if they will allow you to meet your goals.

I look forward to reading about the outcome of this project. Have fun.

gwilliams20 · 8th June 2010, 08:16 PM

Thanks for taking the time to respond, jaekfre.

To clarify, I am planning on constructing an eight cu.ft. enclosure for each woofer. I understand two should sound better than one. About 25hz at a modest level will probably be enough for me. I don't want to have to re screw the sheetrock on the ceiling.

I am trying to keep this project as simple as possible. I am a rank beginner and other than wood working and soldering skills, I am lost.

I realize The things I will be doing will not sound as good as top of the line equipment, but I'm hoping for a better than average performance from them. I am going to give it my best shot and accept the outcome, whatever that may be.

GM · 9th June 2010, 01:53 AM

Q of about 0.6, so should be as high an SQ as a driver with a high inductance can have short of a well damped TL or horn, so as a compromise, stuffing it to further lower its Qtc is in theory a good plan. Ditto moving the driver all the way to the bottom.

GM

gwilliams20 · 9th June 2010, 02:42 PM

Thanks, GM. The Exodus site does recommend stuffing an eight cu.ft. box 100% with polyester. I am going to do away with the vent and use the same dimensions shown on the Orca Design drawings, so the woofer can be lowered a bit in this case.

Well, got to pickup a few things and get to work.

Brett · 02:54 AM

Quote:

Originally Posted by gwilliams20

Any thoughts on improving this setup such as size, bracing, dimensions or location of the driver?

I read it as 2 drivers in on cab, so that's what the sims below are for: unstuffed, 225L net, 1000W to each driver.

Bracing: a fair amount of it.
Driver locations: depending upon the size and shape of the box on opposite sides will cancel out some vibration and the possibility of the sub walking at high level.

gwilliams20 · 11th June 2010, 04:02 PM

Interesting, Brett. And I appreciate your reply. I wouldn't have expected exceeding Xmax at 30hz. Does exceeding Xmax occur more frequently with smaller or larger enclosures? I'm thinking smaller. I may have to rethink this project.

8th June 2010, 04:12 PM	#1
gwilliams20 diyAudio Member Join Date: Jun 2010 Location: North of Durham, NC	Tempest X-2 in 8 cu.ft. sealed box Folks, I would appreciate some input on this set up, please. I have two 15" Tempest X-2 woofers. I intend to fit them to an eight cu.ft. sealed box comparable to the box for the vented Focal 15" Audiom without the vent. The box plans are on the Zalytron site. Look under Home Theater and then click on the Orca link. The plans are at the bottom of the page. This combination appears pretty straight forward and simple. No filters, no equalization and good response. They (the woofers) will be used with the Aria 6 (for the center and surrounds) also on the Zalytron site and should crossover well at 80hz. Any thoughts on improving this setup such as size, bracing, dimensions or location of the driver? I have signed and notarized permission to build these. All opinions welcomed. Thanks

9th June 2010, 01:53 AM	#4
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Q of about 0.6, so should be as high an SQ as a driver with a high inductance can have short of a well damped TL or horn, so as a compromise, stuffing it to further lower its Qtc is in theory a good plan. Ditto moving the driver all the way to the bottom. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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8th June 2010, 05:45 PM	#2
jaekfre diyAudio Member Join Date: Mar 2009	This would definitely work. It's hard to go wrong with a sealed box. Not knowing your goals of this project makes it hard to advise though. The Unibox spreadsheet is showing a 4ft^3 enclosure with both drivers only 3db lower at 20hz and about 1.25db lower at 30hz compared to the 8ft^3 enclosure. It may be beneficial to look into different enclosure sizes to see if they will allow you to meet your goals. I look forward to reading about the outcome of this project. Have fun.

8th June 2010, 08:16 PM	#3
gwilliams20 diyAudio Member Join Date: Jun 2010 Location: North of Durham, NC	Thanks for taking the time to respond, jaekfre. To clarify, I am planning on constructing an eight cu.ft. enclosure for each woofer. I understand two should sound better than one. About 25hz at a modest level will probably be enough for me. I don't want to have to re screw the sheetrock on the ceiling. I am trying to keep this project as simple as possible. I am a rank beginner and other than wood working and soldering skills, I am lost. I realize The things I will be doing will not sound as good as top of the line equipment, but I'm hoping for a better than average performance from them. I am going to give it my best shot and accept the outcome, whatever that may be.

9th June 2010, 02:42 PM	#5
gwilliams20 diyAudio Member Join Date: Jun 2010 Location: North of Durham, NC	Thanks, GM. The Exodus site does recommend stuffing an eight cu.ft. box 100% with polyester. I am going to do away with the vent and use the same dimensions shown on the Orca Design drawings, so the woofer can be lowered a bit in this case. Well, got to pickup a few things and get to work.

11th June 2010, 04:02 PM	#7
gwilliams20 diyAudio Member Join Date: Jun 2010 Location: North of Durham, NC	Interesting, Brett. And I appreciate your reply. I wouldn't have expected exceeding Xmax at 30hz. Does exceeding Xmax occur more frequently with smaller or larger enclosures? I'm thinking smaller. I may have to rethink this project.