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Down Firing Speaker Ports: Carpet vs Hard Surface

Calling for thoughts, experience, and/or technical of speaker port theory....

I have had, and still own several speaker models and subwoofers utilizing downward firing ports. In most cases, I have always had carpet to content with, and even though all of my speakers have had spikes, I've wondered on the ideal setup scenario. I have tried the following:

1) Granite tiles under the speaker spikes to get the speakers up and allow better air flow. 1a) tiles split to allow the port air to hit carpet. 1b) Tiles together to allow the ported air to hit a reflective surface., or 2) spikes into the carpet which lowers the speaker toward the carpet and somewhat lessons air flow.

The best results seems to be with the tiles only partially gapped.

Any Ported Speaker theorists out there?

Thanks in advance.
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Showing 1 response by audiokinesis

audiokinesis
2,724 posts
 

You’ll probably end up with a marginally lower effective tuning frequency with the port downfiring onto carpet, assuming the feet are fairly short.  That’s not necessarily a bad thing.  Whether or not the difference will be audibly significant, I don’t know.  Which surface is better, well that depends on which results in the best in-room response, and too many other factors come into play for me to be able to predict. 

Duke

occasional subwoofer designer 

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