Well as far as the port was concerned I did something rather
different. Yes I did extend it but I used a novel method. I filled the entire
port with rigid straws which extended into the speaker and extra 2". I
have not taken any scientific measurement but rather relied upon my brother who
is a classically trained musician and also plays the church organ so I was
fortunate to have his trained ear discern any hump in the lower frequencies
which was eradicated by listening tests rather than electronic measurement. I
borrowed the idea of the straws from my old CELEF PE1 speaker. The
airspace configuration is slightly changed as you will see if you
visit my blog (see my initial posting for the address) where I have uploaded a
few images of the internal architecture. Its not a separate enclosure just
extends back about 9" from the front baffle.