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Old 10th May 2009, 07:25 PM   #1
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Default Subwoofer enclosure design

Hi there,
I'm going to make a box for my 10" subwoofer.
I have choosen that I want a soft bass sound, so I'm thinking to make a ported enclosure.
My question is now:
The manufacturer of the subwoofer says the box volume should be 15 liters, but what will happen to the effect of the subwoofer, if I make a larger box, like 30liters? Is it better or doesn't it change anything?

Regards,

Simon H.A.
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Old 10th May 2009, 08:58 PM   #2
Henkjan is offline Henkjan  Netherlands
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with a ported enclosure, you'll need to recalculate the port as well. so there is not a yes/no answer to yr question whether it will be better...
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Old 11th May 2009, 09:03 AM   #3
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Yes you are right,
I did find a side with a calculator, but it needs a tuning frequency.
If I have a tuning frequency of 50hz, what will that mean?

Regards,

Simon H.A.
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Old 11th May 2009, 12:46 PM   #4
Henkjan is offline Henkjan  Netherlands
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may I suggest some light reading...
http://www.diyaudio.com/wiki/index.php?page=Loudspeaker
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Old 11th May 2009, 01:04 PM   #5
tinitus is offline tinitus  Europe
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Default Re: Subwoofer enclosure design

Quote:
Originally posted by Cyberzim
Hi there,

The manufacturer of the subwoofer says the box volume should be 15 liters

but what will happen to the effect of the subwoofer, if I make a larger box, like 30liters?

Simon H.A.

You could get a lower tuning, with some port fiddling

But should be done VERY carefully, or you risk a peak just before rolloff

15liter?
That sounds like a carsub
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Old 11th May 2009, 01:04 PM   #6
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Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.
Simon:
We need a series of specifications of your driver..They are called the 'Thiele Small parameters'.
These specs are necessary for the correct calculations(Yes there is MATH!) of the size & performance of your subwoofer.
We all here can crunch the numbers for you no problem...but we need those numbers to start off with.
There are sophisticated computer programs to do this...some like myself have read a book or two on the subject & our books are well tattered from doing the math & rereading over & over.
__________________________________________Rick.... ........
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Old 11th May 2009, 03:19 PM   #7
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One of the main problem is, that I didn't really get any information with the speaker, and it is a car sub I guess.
It's called "GTX dB Warrior" and can take 1200watt rms.
That's all I can say, but maybe I can measure the subwoofer to get the information I need to make a enclosure? Like the cone area, cone depth etc.
And is it better to have a lower tuning frequency or should it be adjusted to what type of bass sound I want?
It will be used for festivals and outdoor parties, so it must be a enclosure for the best effiency but still has an okay sound. The size of the box doesn't matter so much for me, a large one is fine.
Hope you can help me with this project.

Regards,

Simon H.A.
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Old 11th May 2009, 06:42 PM   #8
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Okay,
I've sent a request for more data's on the subwoofer from the seller, and I'll hope that they can get these informations, so you can help me on how to build the best enclosure for my subwoofer.

Regards,

Simon H.A.
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Old 12th May 2009, 10:00 AM   #9
djk is offline djk
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If this is to be a sealed box, 30L will be fine. The box Qtc will be lower, so it will probably sound better.

It cannot be ported without T/S parameters.
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Old 12th May 2009, 12:38 PM   #10
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I just think I will make a 30 liter sealed enclosure for my sub since I cannot get these T/S datas for my sub.
Hard bass is also good

Thanks for your help.
Next time I will look more on T/S before I buy a subwoofer.

Simon H.A.
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