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RE: not offset ?

Posted by tomservo (M) on October 3, 2015 at 09:30:43

In Reply to: RE: not offset ? posted by freddyi on October 2, 2015 at 14:46:26:

Hi Freddyi
The big red peak is an organ pipe resonance, this happens at the 1/2 wavelength, the lowest frequency a pipe or duct open at both ends will resonate at.
The easy way around these with a bp speaker is to use a passive radiator instead of a port as they have no pipe resonance.
If you can get inside the cabinet, you could use another duct or pipe with a closed end to make an absorber at that frequency. I put several of those inside the DTS-10 cabinet at work which do this job.
What you would want to do is attach a pipe with a closed end to the port at it's mid point, make the length a bit more than 1/4 wavelength at the peak frequency. If possible, make it so that you can trim the length based on it's effect on the peak (trial and error measurement). A 2inch diameter plastic water pipe ought to be about right.
Hope that helps
Best,
Tom
Danley Sound Labs

• pipes   (Open in New Window)

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