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Multi-Way Conventional loudspeakers with crossovers

Strange things calculating Vb
Strange things calculating Vb
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Old 24th July 2005, 04:49 AM   #1
peca_ns is offline peca_ns  Yugoslavia
diyAudio Member
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,


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
diyAudio Member
Join Date: Jun 2005
Location: The Netherlands

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
diyAudio Member
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?
DIYaudio for President !
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Old 12th August 2005, 06:32 AM   #4
peca_ns is offline peca_ns  Yugoslavia
diyAudio Member
Join Date: Jul 2005
Location: Serbia
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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