Also, How critical are the resitor values given that the tolerances of most power resistors are 5-10%? The reason why I ask is in my search for parts sometimes I cannot find an exact value, (15ohm instead of 16, 27ohm instead of 25, ) and I'm wondering if I vary this slightly if it will be audible. (especially on the tweeter)

Would you recommend that I not vary from a round port? I tend to favor how a rectangular port can sometimes be less prone to noise. Can I do a rectangular port as long as the total port area remains the same?

Thanks for your patience- I bet you just love it when guys ask questions about changing your (proven) design....

Eat Mo' Hot Sauce...
crazychile