Linkwitz transformer vs Bass Box

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emosms

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Joined 2010
Hi, why there are such differeneces...?

I am trying to use this spreadsheet:
- http://www.sound.westhost.com/linkxfrm.zip

For a given enclosure and speaker T/S this is the spreadsheet result
- http://s23.postimg.org/wo1sq6dzf/linkwitz.jpg
- F3 = 38.88 Hz

I simulate the same box size and driver data in Bass Box, vented cab
- http://s7.postimg.org/ecuzv61qz/bassbox_vented.jpg
- F3 = 24.86 Hz

Bass Box simulation for a sealed cab
- http://s30.postimg.org/3ywljcgpd/bassbox_sealed.jpg
- F3 = 48.5 Hz

F3 is not the same as in BassBox, neither for sealed nor vented box.

My point is to design the minimum box size, where I can have no more than 6 db linkwitz transformer gain to get -3db/20hz.

And these results are so confusing..

I even wanted to have 0 db at 20hz, but then I have to use over 12db gain and I will go beyond the speaker RMS rating
 
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