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I have a pair of kicker subwoofers (kicker 40dcwr122) they came in a ported box. Can I put these subs in a sealed box and if so how much air space is required?

Here’s a professional discussing sealed vs vented boxes and a video: https://www.crutchfield.com/S-tY1pC6mNPG

@cdldriver yes you can. A12" driver requires 1.736 cu ft and let Kicker show you the exact math on how to build your enclosure. Use this site for the math.