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Old 14th November 2011, 07:15 PM   #41
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Ok all , sorry for delayed response was away out of country.

Just took up the measurements.
Fs=41 Hz !!!!!!
Qts=0.55
Qms=7.0
Qes=0.59

I put it in a sealed box of Vb=82 litre and Fb=44.5 Hz giving VAS=14.8 litres


Now 14.8 L is small Vas, the driver sensitivity around 88. WinISD gave me 1.44 cubic feet with 30 Hz tunning ??????for c4.sc4 chebyschev...for most output in 30-40 hz range which is good enough for music. for below 30 Hz i have to go extended bass shelf. ??

BUT the wison watch dog is actually around 4.8 cubic feet external. with bracing, port and separate box for amp i expect it to be around 3 cu feet or around 140 L. BUT winISD gave me 1.44 cubic feet ??? with 4,6 inch tube going 32 inch long ????

HELP HERE please
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Old 14th November 2011, 07:21 PM   #42
badman is offline badman  United States
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You want the Fs to double, so shrink that box down much smaller, if you want a meaningful Vas measurement. That said, it does seem like a tiny Vas.

Quote:
Originally Posted by muddasirwaheedmalik View Post
Ok all , sorry for delayed response was away out of country.

Just took up the measurements.
Fs=41 Hz !!!!!!
Qts=0.55
Qms=7.0
Qes=0.59

I put it in a sealed box of Vb=82 litre and Fb=44.5 Hz giving VAS=14.8 litres


Now 14.8 L is small Vas, the driver sensitivity around 88. WinISD gave me 1.44 cubic feet with 30 Hz tunning ??????for c4.sc4 chebyschev...for most output in 30-40 hz range which is good enough for music. for below 30 Hz i have to go extended bass shelf. ??

BUT the wison watch dog is actually around 4.8 cubic feet external. with bracing, port and separate box for amp i expect it to be around 3 cu feet or around 140 L. BUT winISD gave me 1.44 cubic feet ??? with 4,6 inch tube going 32 inch long ????

HELP HERE please
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Old 14th November 2011, 07:23 PM   #43
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no i never said i wanted Fs to double ??? i wanted it to be low but i cannot understand how there is so much discrepancy in box volume.
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Old 14th November 2011, 07:26 PM   #44
badman is offline badman  United States
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Quote:
Originally Posted by muddasirwaheedmalik View Post
no i never said i wanted Fs to double ??? i wanted it to be low but i cannot understand how there is so much discrepancy in box volume.
To get an accurate Vas measurement, you want the Fb to be double or more times Fs. Your test box is too big to get a good grip on the Vas.
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Old 14th November 2011, 07:39 PM   #45
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Ok i got the point, then i think the vas calculation is wrong. can i use weight method. any brief link please. would 100 g do.
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Old 15th November 2011, 03:48 PM   #46
tb46 is offline tb46  United States
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Default Link for T/S parameter measurement:

Measuring Loudspeaker Driver Parameters

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