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Old 24th July 2005, 04:49 AM   #1
peca_ns is offline peca_ns  Yugoslavia
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Join Date: Jul 2005
Location: Serbia
Default Strange things calculating Vb

I've searched the forum, but I haven't found answer to my question.. I have some drivers from few years ago and I want to make new enclosures and crossovers for them. But, when I started calculating required volume I got totally confused. JBL Speaker Shop says that I nedd 46.65 liters enclosure for Qtc of 1.0 ... Just to check I did some searching on Google and found some calculator which gave me exactly the same results..But on second website calculator showed that I need 80l enclosure...On some 3rd site calculator there said that I need 77l enclosure...Which one is correct? My driver is: Vas 39 liters, Qts 0.82 Qes 0.99 Qms 4.73 Fs 35Hz, 4Ohm.

Thanks in advance,

Peca.

P.S. Sorry to start my first post with question
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Old 10th August 2005, 08:04 AM   #2
e-side is offline e-side  Netherlands
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Join Date: Jun 2005
Location: The Netherlands
Hi,

You could use WinISD to calculate the box volume. It gives

Closed box
Volume = 150,7 L
Qtc = 0,92

I don't really believe those calculators on websites, i rather use programs like winisd, which are used by many people.

best regards
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Old 10th August 2005, 02:19 PM   #3
simon5 is offline simon5  Canada
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Join Date: Nov 2004
Location: Québec, Québec
With WinISD, I just checked, and to get the Qtc to 1.0 instead of 0.92, you need only 78 liters.

That woofer look like crap? Are you sure the T/S parameters are ok?
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Old 12th August 2005, 06:32 AM   #4
peca_ns is offline peca_ns  Yugoslavia
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Join Date: Jul 2005
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Yes, I'm sure...I measured parameters myself and came up with sam results...Anyway, enclosures and crossovers are finished and it all aound very good...I made it by calculations from JBL Speaker Shop...
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