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Old 12th November 2014, 02:57 AM   #1
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Default Tall, upward firing sub. Help requested.

Can someone help me design a subwoofer / helper woofer similar to the design on the second to last page of this document.

https://www.passdiy.com/pdf/el-pipe-o.pdf

I want to make it from wood (not a Sonotube) and it would be square (not round).

Goal: The goal is to make a tall, upward firing enclosure that won't vibrate the floor in my apartment. I don't want to disturb the neighbor below. I want to use the ceiling as bass reinforcement and I plan to place this in a corner. I am hoping by making the opening at the top (I'd go as tall as seven and a half feet - my ceilings are 8 feet). I am hoping this type of design, especially with the woofers open at the back, would not vibrate the floor much.

Can someone model a simple enclosure made from plywood that would generate bass down to about 50Hz or lower using a typical 8" woofer? I am not looking for state of the art performance, only a solution so not to bother my neighbor. Additionally, what specs would the woofer need to be?

Currently, I'm using an H-frame with Eminence Alpha 15's. The floor vibrates so much!

Many thanks in advance!
Zilla
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Old 14th November 2014, 11:40 AM   #2
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by Godzilla View Post
Can someone help me design a subwoofer / helper woofer similar to the design on the second to last page of this document.

https://www.passdiy.com/pdf/el-pipe-o.pdf

I want to make it from wood (not a Sonotube) and it would be square (not round).

Goal: The goal is to make a tall, upward firing enclosure that won't vibrate the floor in my apartment. I don't want to disturb the neighbor below. I want to use the ceiling as bass reinforcement and I plan to place this in a corner. I am hoping by making the opening at the top (I'd go as tall as seven and a half feet - my ceilings are 8 feet). I am hoping this type of design, especially with the woofers open at the back, would not vibrate the floor much.

Can someone model a simple enclosure made from plywood that would generate bass down to about 50Hz or lower using a typical 8" woofer? I am not looking for state of the art performance, only a solution so not to bother my neighbor. Additionally, what specs would the woofer need to be?

Currently, I'm using an H-frame with Eminence Alpha 15's. The floor vibrates so much!

Many thanks in advance!
Zilla
Hi Zilla,

Have a look at the submitted Pictures:

b
Attached Images
File Type: jpg Dayton Audio DA215-8_Pipes.JPG (620.3 KB, 161 views)
File Type: jpg Dayton Audio DA215-8_T-QWP.JPG (600.5 KB, 151 views)
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Old 16th November 2014, 09:26 PM   #3
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I have tall subs almost 4' mltl, that use a 6.5". Even with force cancellation the acoustical energy is plenty enough for any neighbor to hear. Without force cancellation they vibrate only in the vertical plane. Altho Im on a slab, attention to this detail is important and should be minimized. These vibrations are not so deep as to cause this annoyance, what comes out the port certainly does.
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Old 2nd December 2014, 02:08 PM   #4
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Thank you folks! Yes, no matter what I do seems to be innefective. The answer must be a more room friendly sub... or no sub at all... for my apartment.

I can still enjoy the music just without room shaking bass. It's all good.

Godzilla
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Old 4th December 2014, 03:20 PM   #5
more10 is offline more10  Sweden
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Hi Godzilla. Do you want to make the design yourself or do you want someone to make the design for you?

I believe what you want is a single folded Tapped Pipe. Like this:

Click the image to open in full size.

(from thread New sub design? Constricted Transflex, simple build (series tuned 6th order))
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