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Message: <blockquote data-quote="hispls" data-source="post: 8403545" data-attributes="member: 614752">Easiest would be to use a round external port.   Sono tube would be great for testing.  Go with 5 cube (or larger) box and get yourself a 10 or 12" round tube or pipe.  Start with the port 22" long and cut off an inch at a time and test to see which tuning is best.   Once you have a good length, reinforce it with fiberglass or buy a flared steel port or something more solid.Testing multiple tunings is fast and easy with sono tube ports.Or if you like to use a slot port, make a HUGE one, like 130 square inches tuned to 55hz then add 3/4" MDF to a port wall to tune lower a little at a time.  This is a little more tricky but also a decent option to test different tunings fairly easily.</blockquote>

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