LocknLoad Posted April 8, 2009 Share Posted April 8, 2009 Occasionally I've seen ported speakers that have their ports "stuffed" with open cell foam - KEF ships their bookshelf speakers with foam specifically for this purpose. I haven't been able to determine from what I've read - does stuffing the port create more bass, or less? Anyone have any experience with this? Or I guess, what's the point I'm missing? 1 Quote Link to comment Share on other sites More sharing options...
Mallette Posted April 8, 2009 Share Posted April 8, 2009 It would create a bit of resistance to tighten up the bass, producing sort of a hybrid acoustic suspension. Dave Quote Link to comment Share on other sites More sharing options...
richinlr Posted April 10, 2009 Share Posted April 10, 2009 Foam also changes the effective density of the air in the port or in the box. The primarily reason for doing this is that the density change results in a change in effective volume. I can't remember which way but I think adding foam or stuffing increases the effective volume. The speed of sound in foam or other stuffing is also different than in free air. This may be the primary reason the port is stuffed. Air movement in a port can exceed the speed of sound and stuffing can be used to change the speed of sound so that this is not a problem. Quote Link to comment Share on other sites More sharing options...
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