You definitely need to know what you are doing. You are essentially tuning an enclosure when you add ports to it and creating a bandpass style sub. That is, unless you can get a ton of air out of the enclosure. I tried to do that with my old Sanger and got no benefit from it. I ran 4, 4" ports with a sealed box 15". So, just an FYI..... Most likely not worthwhile.
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