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Old 30th December 2003, 11:27 PM   #1
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Default Finished my Maelstrom Sonotube after almost a year of work

I posted about this subwoofer project earlier this year with some pictures of the construction and a description of an idea for a closeable port. So I went on a journey to have a Port Valve turned from Oak. Well the guy who was going to do the turning gave up on me so I went and bought a lathe and did it my self. Im actually glad I got the lathe, beside it being a lot of fun I was able to get the valve just the way I wanted it and the valve seat fits so tight that I will only need a thin gasket to finish the seal, so Im very happy with the functionality of the entire Vale mechanism, it works very smooth and only a few twists of the knob and the Valve is closed very tight.

Besides the 5 month delay to get an acceptable Port Valve turned the project so far has taken about 300 hours over 4months and cost about $1200 US for each of the 2 Maelstrom 18 Sonotubes. I still have a few details to finish but this one is ready to go into the listening room. Next I will silkscreen the plate behind the Valve knob with a placard that will show the Open and Close position, and a felt gasket on the valve seat to complete the seal. The prototype worked very well so Ive already had many hours to listen to a working version of the port valve in a real world situation, and it does work very well to tighten up the bass when the valve is closed, pulse its somewhat decorative and functional as a display shelf. Now all I have to do is fix all the rattles in the house that just one of these has brought to my attention. Hopefully early this New Year I will have both subs in the listening room and have the BFD E.Q. set up properly.
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Old 30th December 2003, 11:28 PM   #2
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Default Port Valve Closed for Music

A pic with the Valve closed
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Old 30th December 2003, 11:30 PM   #3
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And the bottom showing the Maelstrom 18" driver.
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Old 30th December 2003, 11:33 PM   #4
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And the unfinished valve knob, locatated at the front of the sub.
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Old 31st December 2003, 01:14 AM   #5
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You are indeed the KingDaddy. That's a totally awesome and unique sub. And to your neighbors, be afraid, be very afraid.
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Old 31st December 2003, 02:24 AM   #6
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Here is the Mack Truck window crank mechanism that moves the Port Valve.
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Old 31st December 2003, 02:26 AM   #7
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And the Woofer Mod that was necessary to keep the port valve stem perpendicular to the center of the port opening.
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Old 31st December 2003, 02:27 AM   #8
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I remember when you first proposed the idea. I'm very impressed with your perseverence to see it through to fruition.
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Old 31st December 2003, 02:38 AM   #9
SY is offline SY  United States
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Awesome. This is DIY at its best. Any response or impedance measurements yet?
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Old 31st December 2003, 03:34 AM   #10
Variac is offline Variac  United States
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a 5 angle valve grind might give you better flow

You could also just have a threaded rod at the end of the valve stem and spin it down to close it, but all that spinning is a lot of work!

Are you closing it to try intermediate tunings?In other words does the bass slowly tighten up as you close it?

Also keeps the cats out.
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