I've decided to keep my 2 12" Memphis M3's and my 1000d and not get a X.X.X. for financial reasons. Anyways right now my box is sealed but I want to go ported. Memphis says to tune it to 38 hz. Is this too high for rap/rock and could I tune it to 35hz or should I just stick with what the site suggests? Also does 1.6 cuft per sub seem like enough. I have about 1.5 per sub in my sealed box so I figured it would be more like 2cuft. Sorry for the long post and any help would be greatly appreciated.