Strange things calculating Vb

[peca_ns]

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

 

[e-side]

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

 

[simon5]

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?

 

[peca_ns]

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...