| keyser |
hi,
i have two visaton W 300 S woofers lying around. I have already calculated a good reflex-box. however, 150 liter times 2 is still 300 liters!
That's a bit too much for me. Now i am thinking about using the two to get an isobaric subwoofer. I know what it is. The box volume will be half of 150 (75 liters). I don't know how i am supposed to calulate the bass-reflex or Fb.
anyone?
thank you |
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| Svante |
| Half Vas, keep fs and Qts. |
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| keyser |
ok,
what would this do to my tuning frequensie and port-length with a 104 mm pipe?
i've already got the new boxvolume, its 150/2= 75 liters.
The reflex pipe for the 150 literbox should be 10.5*20 cm to be tuned at 25 hertz.
what happens to the pipe when in 75 liter isobaric? |
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| BassAwdyO |
| The box tuning is not effected by the speakers in the box. The response is! In my experience always mount Isobaric subs vertically (with the magnets in a vertical line). This gives more excursion as the cones sag. |
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| Ron E |
| quote: | Originally posted by keyser
ok,
what would this do to my tuning frequensie and port-length with a 104 mm pipe?
i've already got the new boxvolume, its 150/2= 75 liters.
The reflex pipe for the 150 literbox should be 10.5*20 cm to be tuned at 25 hertz.
what happens to the pipe when in 75 liter isobaric? |
The tuning frequency stays the same. The port length will about double for the same diameter pipe. A smaller box needs a longer port to maintain the same tuning...
Do a search for the formula, or enter the parameters for teh driver with Vas cut by one half and figure it out with a program. |
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