ported enclosure

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So, I have some knowledge on the basics of building subwoofer enclosures, but have a couple questions. I am planning on building a ported box for 2 Skar Audio DDX-12's (1000 RMS @ 2 ohm) wired to a 1 ohm load (amp is a Skar Audio RP-1500.1D). Here are my questions: 1. Do you have to tune your...