G'day folks! I am currently building a couple of subs for a small PA system.
I'm going for a ported design and I'm wondering how critical port dimensions 
are.  I've seen a lot of cheaper commercial designs that just have a 
rectangular "hole" at one end of the baffle, very few seem to use a round 
port of a specific length as in HI-FI stuff.  Is this because it doesn't 
matter or they don't care?  I'm using a single RCF L 15P 530 in each box (if 
they ever arrive!), the catalog suggests a port 150mm ID by 127mm long but 
that won't fit on my frount baffle.  I figure two 100mm ports will have the 
same area so I'll go with that.  A nagging question remains... does it really 
make much difference?  A rectangular port is much easier to make.  Any advice 
would be appreciated :).
  
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