Help analysing the Graph Plots for my design - diyAudio
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Old 10th March 2012, 02:36 PM   #1
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Default Help analysing the Graph Plots for my design

Hi all !!!

This is my first trial build. I have done some work in BassBox Pro and would like some help analysing the Graph Plots for my design..

I was trying to go down to or near 40hz but the best am geting is 49hz. thats fine for now but what bout the other detail in the plot

pics...

http://postimage.org/gallery/vdzb5x4/

Last edited by OhhSoBadly; 10th March 2012 at 02:42 PM. Reason: LINK TO PICS ... http://postimage.org/gallery/vdzb5x4/
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Old 10th March 2012, 03:54 PM   #2
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The box you show is designed for maximum output with flat response.
You can tune the box lower using a longer port if you want lower extension, but the box will then roll off slightly in response down low, Hoffman's Iron Law at work.
If you prefer the extension of another 1/3 octave and can live with the reduced upper output, go for it.
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Old 10th March 2012, 04:14 PM   #3
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Thanks for your reply 'weltersys' the box I am doing is a 45.77lt (15.5'') sealed box. The flat response is a good thing right? as I am looking for quality aswell.
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Old 10th March 2012, 05:20 PM   #4
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Quote:
Originally Posted by OhhSoBadly View Post
Thanks for your reply 'weltersys' the box I am doing is a 45.77lt (15.5'') sealed box. The flat response is a good thing right? as I am looking for quality aswell.
Flat response is a good thing, but the response of your sub in room will not be flat.
Placing the sub in a corner or near walls will increase low response more than upper response.
Many (myself included) would prefer lower extension with slightly less output, to a flat response that rolls off like a rock an octave above the low note on a grand piano .

Art
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Old 11th March 2012, 12:20 AM   #5
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Art,
+1

OSB,
the link you posted is broken..
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Old 11th March 2012, 11:36 AM   #6
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The link is Postimage.org / gallery - Ca R, CD, Gd, Ma P, Mei P, Na R, Ph R, Si

Art?

So lower extension it is then... What next?
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Old 11th March 2012, 06:28 PM   #7
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Quote:
Originally Posted by OhhSoBadly View Post
So lower extension it is then... What next?
Make some sawdust, experiment with different tunings, report back with what your preference is.
Art
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Old 12th March 2012, 08:10 AM   #8
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Dito.. watch this space
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Old 18th March 2012, 04:49 PM   #9
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Hi Guys. just a quick up date.... I have mod the box design a bit. Made it a 18" cube with a sigle brace (this is a first build on a budget). It now goes to 47hz flat.

I was lucky to get my local DIY store to do the cuting. So now ...... some glue, screws, sealant..

Some CAD pics... Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 18th March 2012, 05:49 PM   #10
a.wayne is offline a.wayne  United States
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It's a sealed box ?.... Pull out the EQ or fergit about it ........
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