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Bassface 15.2 ported enclosure
Bassface 15.2 ported enclosure
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Old 9th March 2019, 11:09 AM   #21
mariadumitruiulian is offline mariadumitruiulian  Ireland
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Join Date: Jan 2019
Location: Limerick, Ireland
Quote:
Originally Posted by johnsurnamerobinson View Post
Have a look at subwoofer diy site lots of guidance and tools you seem to know about t/s parameters so some of the spreadsheets ect, may be very usefull to you. Also deep deep in the vaults of this site you will find loads of helpfull info
Go-on build a new one its great fun and you know it makes sense
I didn't realize that there is a subwoofer section. Thanks!

Now , if we forget everything , let's say i don't have any box and i just want to build one.

My space for the box is as follows ( 50X50X75cm or 50X45X80cm).
I want a box that:
- has a good kick so should be BR (i would prefer a balance between SPL and quality)
- has a slot type BR (here i think i need surface of the slot, depth and minimum width to avoid air speed to get too high)

Now question about TS parameters... Do you see anything wrong with them?
I ask this because when i start to enter them in Win ISD, the VAS is automatically calculated and it's 10 times smaller than the one given by the manufacturer.

What order do you put the parameters in ? And what parameters are you putting in? All of them? Some of them?

Thanks!
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Old 9th March 2019, 06:17 PM   #22
Jakobsson is offline Jakobsson  Sweden
diyAudio Member
 
Join Date: Apr 2009
Quote:
Originally Posted by mariadumitruiulian View Post
I didn't realize that there is a subwoofer section. Thanks!

Now , if we forget everything , let's say i don't have any box and i just want to build one.

My space for the box is as follows ( 50X50X75cm or 50X45X80cm).
I want a box that:
- has a good kick so should be BR (i would prefer a balance between SPL and quality)
- has a slot type BR (here i think i need surface of the slot, depth and minimum width to avoid air speed to get too high)

Now question about TS parameters... Do you see anything wrong with them?
I ask this because when i start to enter them in Win ISD, the VAS is automatically calculated and it's 10 times smaller than the one given by the manufacturer.

What order do you put the parameters in ? And what parameters are you putting in? All of them? Some of them?

Thanks!
The first thiele/small field are the most important, Q values+ FS
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Old 15th March 2019, 08:30 AM   #23
TBTL is offline TBTL  Germany
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Join Date: Oct 2013
Good kick is more likely to be achieved with a closed box.
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Old 15th March 2019, 08:33 AM   #24
mariadumitruiulian is offline mariadumitruiulian  Ireland
diyAudio Member
 
Join Date: Jan 2019
Location: Limerick, Ireland
Quote:
Originally Posted by TBTL View Post
Good kick is more likely to be achieved with a closed box.
I don't think this box was built to run in a closed box... I got an answer from the manufacturer, and they insist on a 3,5 cu ft (100L) box tunned at 35 Hz.

Can any of you, more experienced that i am, can tell me the optimal port area and depth for such a box?

Thanks!
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Old 15th March 2019, 10:00 AM   #25
fatmarley is offline fatmarley  England
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Join Date: Aug 2003
Location: Cheltenham
Regardless of what the manufacterer says, you want a flat response or a gently rolled off bass in car. What you DON'T want (unless you like boomy bass) is deep bass that's louder than midbass.
I've spent quite a lot of time modeling various subwoofers lately and I added cabin gain to my sims that closely matches one done by JBL (+25db gain at 20hz).

Your woofer in a sealed box gives a very flat response in 100ltr sealed using THIS to estimate cabin gain. Obviously all cars are different but sealing the ports would be a good start. If you still have too boomy bass after that, I would reduce the box sixe to 75ltr. You really don't need a port in a car, unless you're looking for maximum SPL.
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