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Old 26th March 2008, 07:47 AM   #11
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Hi GM, you can also increase volume, like setting the cross section area to 4 times driver Sd. This will compensate for a high density stuffing.

I agree drivers with relatively high Qts should be used.

Hi from
Bjorn
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Old 26th March 2008, 11:22 AM   #12
CarlosT is offline CarlosT  United States
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Because the cabinet design I'm working with only offers a mounting plate for the driver of about 15" x 18", I'm limited to either 10" or 12" drivers. The lore is that cones larger than 12" can get into trouble and are not strong enough (too much cone area...not enough strength in the cone material and surround) for a TL although most commercial offerings from crap like Cerwin Vega's Earthquakes to even decent Yorkville LS808s use 18" drivers.

Also from the sounds of it, a larger cone will require a larger cross area and will lead to an unwieldly cabinet size. The design I'm working with is about 30" H x 30" D x 18" W.
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Old 26th March 2008, 11:30 AM   #13
CarlosT is offline CarlosT  United States
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When you look at these DJ type folded subwoofers is the entire front open area in effect the port area you guys refer to? Can't be...right?

Click the image to open in full size.

This BTW is what I'm trying to avoid like the plague...a nasty box weighing 160+ lbs...
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Old 26th March 2008, 10:39 PM   #14
GM is offline GM  United States
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Quote:
Originally posted by Bjohannesen
Hi GM, you can also increase volume, like setting the cross section area to 4 times driver Sd. This will compensate for a high density stuffing.
Greets!

?? If you increase net Vb it will require more stuffing to get a given +/- dB 'ripple' tolerance.

GM
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Old 26th March 2008, 10:43 PM   #15
GM is offline GM  United States
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Quote:
Originally posted by CarlosT
When you look at these DJ type folded subwoofers is the entire front open area in effect the port area you guys refer to?
This is a folded compression horn, so yes, that's its 'port' area. Typically when you want small and loud you use multiple small cabs and stack them so their mouth areas combine.

GM
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Old 27th March 2008, 10:17 AM   #16
Thawach is offline Thawach  Thailand
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Hi MJK TLTL



i am downloading. i don't know that i can use? i'm stupid for this(exell-spreadsheet).but i will to try.i think sometime my god to helps me.lol



yeah yeah




-------------------------------------------

the next time i choose Arsenal TM.lol
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Old 27th March 2008, 04:25 PM   #17
MJK is offline MJK  United States
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Thawach,

To run my worksheets you will need to install MathCad. There is a free download version that is on my Models page. You will need to download and install this software.

Then you can open the sample problem to make sure it runs correctly on your PC and to try your hand at editting the inputs. If all goes well, you can decide to buy a license at which time I will send a user ID and password so you can access all of the latest worksheets. Pdf files showing the diferent worksheets are on the Models page.
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