JA>         I would disagree with your belief that speaker port shapes do not
JA> matter. It matters just as much as the internal shape of the loudspeaker
JA> enclosure does. 
JA>         The whole theory of porting is to allow for the evacuation of 
movin
JA> air from the rear half of the moving cone, and to "tune" that moving 
air/so
JA> to a specific frequency while doing so, and reinforcing lower bass 
signals.
JA> ports diameter in relation to its' length has just as much to do with the
JA> tuning process as does anything else in a loudspeaker design. Ports are 
als
if you read my original message I stated that from my experience, as long as 
the port's opening size and port lenght remains the same, the shape can be 
manipulated.
JA>         Port placement is also extremely important. Too close to an 
interna
JA> speaker wall and the port looses efficiency and tuning. Set centered on 
the
JA> box causes a boomy, "goofy" sound that is very inaccurate and just as 
usele
JA> except for car audio. From what I have seen this goofy, boomy sound is 
he
JA> desired effect in car audio.
although I am into car audio I have never seen this effect.. 
at work we have a standard size of box that we sell quite a few of, and we 
place the ports depending on where they would best suit the customer's car, 
and I've never noted a change in sound quality or "goofy" sound..
Jason Lavoie
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