The port opening has to be 1.25" from the walls for best performance. I would like to use some extra bracing in the first corner after the port. I want to know if the port should maintain 1.25" distance away from the brace and wall until it starts to flare into the horn. Does smoothing the sharp edges inside the horn help? Also when clamshelling speakers how does that affect the Vas? YES I'm a stup! How do I determine the size of the sealed section with the Vas of the speaker especially if I'm clamshelling? Too much whiskey in the early years has limited my IQ. ALL HELP APPRECIATED.

[quote author=HT-EXT  link=1135170500/0#0 date=1135166900]..... Also when clamshelling speakers how does that affect the Vas? ..... [/quote]
In theory, the Vas is cut in half when you clamshell. I clamshelled 4 matching drivers in one WO and did not re-adjust any volumes and it was still a vast improvement in tight, controlled bass at high power levels. Not very noticeable at first when played at low power levels. When you really push them, the clamshelling helps control pulse transient "over rings" very well.

[quote author=DirtDawg  link=1135170500/0#2 date=1135176818]
pulse transient "over rings" very well. [/quote]

sounds real sexy, wonder what it means