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Old 17th February 2008, 03:47 PM   #1
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Default Model III

Well, here are the first iteration of the S.P.Q.R. Model III plans. No cut sheet yet but this should be enough for those that have shown interest in getting started on the enclosure now.

(As Usual) These plans and all contents herein are copyright, 2008 Thomas Petzwinkler. They are intended for DIY use only, any and all commercial use will be viewed as a violation of the copyright holders rights under the law and will be prosecuted accordingly.

I wish it was a world in which I didn't have to add that. Ah well...

Enjoy!

http://www.box.net/shared/u4rs0mntw0
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Old 17th February 2008, 04:25 PM   #2
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I almost forgot. If you look at the plans, you will see that I designed the back chamber to be built bigger if desired and therefore tuned. The back chamber is tuned around 150 Hz now but can be adjusted up to 160 and by my estimates down to 120 Hz. Just a thought.

Tom
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Old 18th February 2008, 02:04 AM   #3
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A bit of the S.P.Q.R. style applied. Curved terminus and open area in bottom rear. Working on a solid render just like I did for the Model II.

Tom
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Old 18th February 2008, 05:28 AM   #4
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That looks good... it would be easier to build if it was 60" high (to fit a 60x60" sheet of BB.

dave
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Old 18th February 2008, 10:53 AM   #5
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That is an excellent point. Let me squeak my numbers. I am sure it will be possible without affecting the horn whatsoever. Thanks Dave!

Tom
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Old 18th February 2008, 12:04 PM   #6
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Ok, I have updated the plan. The enclosure is now 60 inches high. This will be ideal for building with Baltic Birch. The only alteration this made was driver height. The driver height went from 36 inches to 34 1/4" from ground to center of driver. This should be better than 36 as most builders will be putting spikes on the cabinet which will raise driver axis to around 36 inches anyway.

Link to new file. http://www.box.net/shared/ehlobrz40c

Thanks for the input Dave! Good luck everyone!

Tom
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Old 19th February 2008, 04:57 PM   #7
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Quote:
Originally posted by Harderror
The enclosure is now 60 inches high.
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