I can verify I have used both the SVS PB1000 Pro’s in pairs, as well as the SB1000 Pro’s in pairs and my dinosaur Mirage BPS-400’s are both sealed but my pair of Mirage OM-200’s aren’t. Once properly calibrated I’ve never heard an audible difference in terms of my sealed subs being superior for music and ported subs being superior for home theater. Using a MiniDSP 2x4HD I’ve even mixed ported and sealed subs when I had to and again, I had great performance with usable output down to 14hz. That being said I listen to a wide array of material from native Atmos & DTS:X films and games, to two channel and multi channel native music and both my ears and REW confirm there’s no quantifiable difference in performance. Low end extension depending on what subs you’re comparing sure, but never have I listened to say the Beatles Abbey Road in Atmos with sealed subs and than listened with ported and thought they were “slow” or “in accurate” it’s just one of those old audiophile things like 3dB stated that people parrot and come to believe without doing any research.