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Old 5th January 2006, 03:39 PM   #11
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Quote:
Originally posted by sreten


Yup, 125 and 200 litres according to the specs you posted,
main cause is the 125L Vas of the driver.

http://www.partsexpress.com/pe/showd...number=264-833

note the Vas of 18.5L.

/sreten.
Something is wrong, I doubt that 125L of VAS is right, cannot be. Everybody uses this sub in 30 ~ 55L boxes !
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Old 5th January 2006, 04:59 PM   #12
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And what about this one?

http://www.keybass.com.br/car_subwoofer.htm

Cheap too ! 80 us dollars for me !

Fs = 23Hz
Qms = 4,92
Qes = 0,48
Qts = 0,43
Vas = 156 (Vas = Equivalent Woofer Volume)
Xmax = 9mm
Xlim = 15mm
Sd = 580cm²
Sensibility = 88db / w / metter


I talked with the manufacturer, and he said that 60L is enough for a very smooth bass and extended, in a VENTED box. The bass will not be so clear and detailed as the sealed, but will be more smooth and extended.

Feedback ?
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Old 5th January 2006, 05:51 PM   #13
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Quote:
Originally posted by -_nando-_


Something is wrong, I doubt that 125L of VAS is right, cannot be. Everybody uses this sub in 30 ~ 55L boxes !
More likely most people don't know what they are doing, and in a car with some bass boost it will be using a the downward slope of the curve so the response will be OK. See the EAS article on the Rod Elliot ESP website for the principle of what - in a fashion - most users are unknowingly doing.

Quote:
Originally posted by -_nando-_
And what about this one?

http://www.keybass.com.br/car_subwoofer.htm

Cheap too ! 80 us dollars for me !

Fs = 23Hz
Qms = 4,92
Qes = 0,48
Qts = 0,43
Vas = 156 (Vas = Equivalent Woofer Volume)
Xmax = 9mm
Xlim = 15mm
Sd = 580cm²
Sensibility = 88db / w / metter


I talked with the manufacturer, and he said that 60L is enough for a very smooth bass and extended, in a VENTED box. The bass will not be so clear and detailed as the sealed, but will be more smooth and extended.

Feedback ?
That one will perform better in a home sub application IMO, but you can't totally go on specs alone, look at the quality of the driver and do some listening tests. The specs only tell the story at one (low level) operating point.
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Old 9th January 2006, 09:39 PM   #14
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Thanks !

Sorry, I was out some days, and I couldn't post reply


I talked to the subwoofer manufacturer, and he designed a 55L vented box!
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File Type: pdf panther55l.pdf (21.0 KB, 9 views)
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Old 10th January 2006, 07:29 AM   #15
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That may be a 55 litres vented box, but it's not using any of the drivers you have listed here.
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