I am going to be building a sealed cab based around some eminence alpha-10a woofers. They work pretty good and have a good tone for bass. But, they also have a bit of a spike at 3khz which can get clacky if you boost treble on your amp. Im going to try a parallel notch filter to remove this first but, I also had another idea. Replacing the hard paper dust cap with cloth or zurrite will smooth out that peak and possibly sound great. But, the alpha has a vent in the magnet to cool the coil. If you remove the solid paper dust cap the air can escape through it and therefore the cab wouldnt' be sealed anymore. So, the question is, can I simply seal up the vent and rely on the cooling of the cloth dust cap? This seems to be exactly what is done on the B810 driver, webers, vintage ampegs, etc.