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 mapman

I use Auralex Subdude  platforms under my bottom ported Ohm 100s.   These are available on Amazon and will not break the bank.  Very effective in preventing speakers or subs from interacting with the floor acoustically which with many home floors is undesirable and results in fat bass that is hard to tame otherwise and obscures detail elsewhere.  I find it always best to eliminate floor interactions any way possible and tweak from there to fine tune the sound.