Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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What low freq for woofer?

Posted by groman (R) on January 7, 2002 at 09:44:43

In Reply to: Cabinet vs. open baffle for mid and tweeter posted by mistergroovy on January 7, 2002 at 08:21:56:

Depends on the lowest frequency
you will use element at.

The baffle need to be large, compared
to the lenght of the lowest soundwave
the woofer sends out.

Distance from center of woofer to baffle edge
plus distance from baffle edge to the woofers
backside center.

That means that to avoid sound wave to go round
and hit woofer from behind.
In a box this is impossible as it is sealed,
the soundwave will not reach backside of
woofer.
If the soundwave reaches backside the
air-pressure changes will be cancelled
and no or less sound will go out forward.

To calculate:
Baffle diameter,(=width for rectangular) not radius,
should be LARGER THAN: (340 000/f) mm, where f is the lower crossover-f
that is to say the lowest f the woofer will work at

This should avoid losses in the frequencies
near the crossover frquency

for tweeter, the 340 000/f millimeters
becomes so small
that that is no problem

The higher frequencies soundwaves are very short

hope you can use this information
and other
correct me if I am wrong!

LSP mathematic
groman

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