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30 Hz easy to build re-entrant horn
30 Hz easy to build re-entrant horn
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Old 19th January 2019, 04:56 AM   #11
GM is offline GM  United States
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Thanks! This one? Dayton Audio RSS390HF-4 15" Reference HF Subwoofer 4 Ohm

Dunno, never done any except at a huge parking lot at least 100 yds away from the plant, though at 50 ft you're ~1130/2/50 = ~11.3 Hz, so wouldn't think so.

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Old 19th January 2019, 05:12 PM   #12
cspieker is offline cspieker  United States
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That's the one. Thanks for all the help! If anyone is interested in building one let me know and I'll share build pics and sketch with dimensions.
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Old 15th February 2019, 09:08 PM   #13
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I would be interested! I'm traveling, and not able to build at the moment, but I'd love to see the pics and sketch to understand it a little better.
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Old 17th February 2019, 08:36 PM   #14
cspieker is offline cspieker  United States
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Click the image to open in full size.

Sorry it looks like a pirate treasure map. It's a little rough but should have the relevant dimensions. Build pics to follow.

My next one will use a 30" plastic cemetube instead of the cardboard cement form. The cement form is very solid. It is not a sonotube brand. I think the plastic would be even more durable and suitable for outdoor applications. I also plan to run the 30" tube all the way to the ground and use a ton of 4" holes to serve as the mouth. That would eliminate the need for the ring 3/4of the way down. If you have the space, you can lay it on its side and face it towards you without the bottom disk. It is a couple dB louder and more impactful like that, just takes up a ton of space. Let me know what's not clear. Craig
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Last edited by cspieker; 17th February 2019 at 08:42 PM. Reason: Add pic
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Old 17th February 2019, 09:59 PM   #15
FornaxG is offline FornaxG
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Thanks!
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Old 17th February 2019, 10:27 PM   #16
cspieker is offline cspieker  United States
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Start here. This is the top of the sketch. The driver back chamber. 18“ diameter tube 9" tall to recess 1/2“ into the grooves for a final height of 8". Then proceed with the 8"pipe. Securing pipe/ cylinders in grooves with polyurethane construction adhesive. Waiting for each step to set up before proceeding. Be sure to put a 3/4" round over on the corner between the compression chamber and the throat.
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Old 17th February 2019, 10:33 PM   #17
cspieker is offline cspieker  United States
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Notice the rabbet to accept the 8“pipe.
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File Type: jpg 20190101_145139.jpg (684.6 KB, 72 views)
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Old 23rd February 2019, 02:31 PM   #18
cspieker is offline cspieker  United States
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Sorry for dragging this out, busy lately.

The skinny end of the "foot tube" is cut off to make it 48“ long. End cap on skinny end is fitted and has a groove to accept the 8" pvc "legs".

Then you cut 4 pieces of 1/2" conduit to act as struts to stabilize the foot tube over the pvc. reach inside the foot tube a foot and a half or so and figure out where the conduit pieces will wedge in tight. Then drive a long screw with a washer through the foot tube, the conduit, and into the pvc.... Wish I had a pic for you.
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File Type: jpg 20190101_145553.jpg (827.4 KB, 52 views)

Last edited by cspieker; 23rd February 2019 at 02:37 PM. Reason: Description not clear.
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Old 23rd February 2019, 02:48 PM   #19
cspieker is offline cspieker  United States
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Now put 4 more pieces of conduit along the lip of the foot tube with screws and washers.
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File Type: jpg 20190112_175828.jpg (948.4 KB, 41 views)

Last edited by cspieker; 23rd February 2019 at 02:55 PM. Reason: Wrong photo
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Old 23rd February 2019, 02:52 PM   #20
cspieker is offline cspieker  United States
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Slide the 30" tube over and secure with more conduit struts. You need some looong screws to engage the pvc at the center, the foot tube is not thick enough to give adequate bite.
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