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Sonosub rebuld Any suggustions? (1 Viewer)

Joe Tilley

Supporting Actor
Joined
Jan 1, 2002
Messages
686
Well the other day my sub got damaged wile having new carpet put in ( The tube got smashed by accident My own fault:angry: )so any how I will be building another one.
My last sub was a sealed 16"by 42" don't know how many liters that is,with a Dayton 15"DVC. It sounded pretty good but this time around I would like to see if I can get just a little more out of it,I was thinking of trying a ported system. Dose anyone have any good suggestions for what I should go with, size is no big concern so I'm pretty open to anything.I'm thinking something around 20"diameter to make building a little easer this time,fitting a 15" sub in a 16" tube was kinda a pain last time.
What I will be using is My current Dayton 15"DVC & PE 250 watt plate amp,Any suggestions on what route to go this time? Thanks for any help..:D
 

Brian Bunge

Senior HTF Member
Joined
Sep 11, 2000
Messages
3,716
Joe,

How about 175L tuned to 17.5Hz with 64oz. of polyfill? All you'd need extra is the 4" dual flared port from PE. Hank Frankenberg and Jeff Lam have both built this and seem to be very pleased with it. I'm building one for a customer and am starting one for my dad as well.

Brian
 

Joe Tilley

Supporting Actor
Joined
Jan 1, 2002
Messages
686
Brian, first off thanks for the response,I know I did get kind of crappy but no one seems to answer anything I post anymore.

What size sonotube will I need to to get 175L & what length will the aroport need to be or,would I just use it at its full length?

Thanks again....
 

jeff lam

Screenwriter
Joined
Jun 4, 2001
Messages
1,798
Location
San Jose, CA
Real Name
Jeff Lam
Joe,

Here is the design I used:

"OK, here's yet another design to kick around... You know, I just come up with these, like I'm a speaker designer or something...

For good "tight" sound, a Q of 0.577 is often used. It's maximally flat in terms of phase rotation (group delay). But, for home theater, you want a pretty low Fc (down around 20 Hz or so). So, how about this:

175L per Tempest

64 ounces of stuffing

Tune to 17.5 Hz (4"ID by 13"L vent; note that our 4" flared vent kit would work well here - yes, that's a shameless plug... )

You'll have a response that:

Has an F3 anechoic of 22 Hz with the typical LFE crossover.

Is power limited to 500W above 15 Hz (for linear operation).

Mimics a 3rd order Q=0.577 Fc=20 Hz filter to +/- 0.25 dB down to 13 Hz.

Should provide a typical in-room F3 around 17 Hz.

Is capable of more than 110 dB SPL from 16 Hz and up, anechoic.

Is capable of more than 118 dB SPL from 17 Hz and up, in a typical room.

How does that design sound? Yeah, it's different again, but should be a good combination between tight articulate bass for music, and smack-you-upside-the-head SPL capability...

Dan Wiggins

Adire Audio"

I felt this design was perfect for my application. Nice tight sound, low tuning and a much smaller enclosure than the EBS.

I used an 18" sonotube 45" long with 2.25" caps on each end.

For a 20" sonotube you would need it to be roughly 34" long to get 175L.

use pi x r^2 x h to get the volume of the tube. if you use all inches, devide by 1728 at the end to get cubic ft. The design is about 6.1 ft^3. I think there are 28.7L per ft^3 if I remember correctly.

Play around with the design and see if it's right for you.
 

Jack Gilvey

Senior HTF Member
Joined
Mar 13, 1999
Messages
4,948
What size sonotube will I need to to get 175L & what length will the aroport need to be or,would I just use it at its full length?
The first question is one of basic geometry. The second can be answered by using one of the myriad free design programs like WinISD or Unibox.
 

Hank Frankenberg

Senior HTF Member
Joined
Oct 13, 1998
Messages
2,573
Jack, I don't have my drawing in front of me, but I did use 24" diameter tube. Just take the volume desired and add for the driver and tube displacement and that's your total gross volume. Plug the volume and diameter into the formula for the volume of a cylinder and solve for the height. Use the dual flared 3" port that Dan Wiggins recommended and use his recommended length.
 

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