Port Reccommendations

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I've got a pair of .3 cubic inch sealed box enclosures loaded with 6 1/2" drivers that I'd like to convert to vented. One of the on-line port calculators gave me these numbers for the port dimensions:

port diameter = 1.5" port length = 5.25 tuning frq = 50 hertz

Before I go cutting any holes, do those sound like good numbers to start at?
 
thx guys... didn't mean to be rude as i respect all your knowleges and experiences...
and i can only speak broken english as a foreigner...
once again thx for all your advices and will wish i can come back soon as i'm done w/ my xover design^^
 
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