Yes, Ive followed your spec's using the 4" port dia w/ 6" length and the filter is just as Akhilesh helped me with although me inductors and resistors are very close but not exact to what y ou mentioned---the main thing I am hear though, is that I reduced the resistor from 10 ohms to something like 3.7 ohms and that seemed to sound the best--certainly took some of that bright "burn" off---allows one to hear a much nice base----still a few details to attend to to really finish the cabs though----think I will install flared port tubes Jim