[CBFryman]

There is a formula for finding the corect tuning frequincy. ive posted it in other threads. you can also find it on JLaudio.com under tutorials. IMO properly ported sounds jsut as good as sealed with an average of 3dB gain. i say ported all the way. it is very hard to properly build a bandpass enclosure as there have only been correct formulas for 4th order band pass which is the lest efficent of the band pass enclosures (only uses sound from one side of the cone). i have seen properly build 6th order bandpas enclosures but it took alot of luck and alot of building and rebuilding....