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Strange size subwoofer (h:120cm,d:105cm,w:35cm)
Strange size subwoofer (h:120cm,d:105cm,w:35cm)
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Old 17th April 2008, 02:23 PM   #1
mvennik is offline mvennik  Netherlands
diyAudio Member
Join Date: Apr 2008
Default Strange size subwoofer (h:120cm,d:105cm,w:35cm)

I am planning to build this subwoofer:

Click the image to open in full size.

I have done the calculations with WIN-ISD and will use
2 Dynaudio 30W54 with the following TS-parameters:
Vas 257 Liter
Qts 0,3572
Qes 0,42
Qms 2,39
Fs 22 Hz
Sensitivity 90dB
Max Power 210 W
xmax 3,5 mm
Moving mass 45,61 g
Disp area 0,04 m2
Re 6,3 ohm

Does anybody want to comment on this, since I'm quite new in this game?
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Old 17th April 2008, 03:07 PM   #2
JakeDN is offline JakeDN  United Kingdom
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Join Date: Aug 2007
I might be totally wrong, but id say not to make it an oblong. You might get standing waves form inside. You'd want a sloping back or something like that. Also, might it not look better if you have one driver at the top, one at the bottom, and the ports in the middle?
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Old 19th April 2008, 09:31 AM   #3
Thawach is offline Thawach  Thailand
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Join Date: Dec 2007
hi mvennik

i surprise that your home is very big like the church. u can use a very big subwoofer! if u do nok like a very big subwoofer. u can change the volume again. about 300-320 litre it increase about 1 db(for super rock concert)

You might get standing waves form inside

JakeDN! it may be changed when the box is bracing inside.

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Old 9th May 2008, 03:14 PM   #4
nunayafb is offline nunayafb  United States
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Join Date: Aug 2005
As I think Thawach was trying to say, if you design your brace accordingly you can stop the standing waves. I would use a single brace as poorly shown in the attached pic and experiment with stuffing to fine tune the sound.
Attached Images
File Type: jpg sw_ontw1.jpg (26.9 KB, 148 views)
Conventional methods yield conventional results
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Old 9th May 2008, 10:27 PM   #5
MaVo is offline MaVo  Germany
diyAudio Member
Join Date: Jan 2006
The lowest standing wave in it will be at about 140hz, between bottom an top end. Crossover well below that and you can ignore the standing waves. Also, making odd shapes doesnt really help against standing waves. It is done to please the customers eye.

Second thought... this is a bassreflex? With 7cm big ports? I think port noises of the air flowing through them could become a problem at higher levels of deep bass. But thats a guess. Generally, try to make ports long and with high crossectional area.
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