Cav, our member BigJohn was an expert on plugging the ports, but he hasn't been around recently and I don't recall that he discussed the sonic effects much.

You might be interested in studying Mark Sanfilipo's article "Five Audio Myths Dispelled" published in Audioholics, especially part 4. which examines the difference between ported and closed speakers. The point is that the port, other factors being equal, extends the low frequency limit but doesn't increase efficiency.

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Enjoy the music, not the equipment.