IMO you are making WAY too many assumptions. I have only heard the 13+ by SVS. Stellar sub. I'm sure the NSD 12's are not slouch either.If they are 96dB per octave they are certainly close to brick wall. And that is my point. You can't paint all this with the SVS brush. Plus crossing over at 80Hz you are talking about 160Hz. The Infinity drivers I am using are good to 300Hz.I tend to be able to produce a decent to more than decent cabinet.