I have 3 of these little MONSTERS but only using 2 at the moment in a 3.51^3 box with a 7 inch octo port on 2.5k amp at 1ohm... everyone thinks I have a 12s or 15s inch subs... these slam hard af!!!! And they definitely create some pressure for sure but I'm about about to buy 1 more and build a 6.33^3 box with a PHATTT center port to fit 4 of these in with 5k amp !!! I cant wait!! And DC Audio is the way to go for high quality CLEAN deep bass that creates all the noise you want!! These take and handle abuse for sure!!! Forget sundown...????