Hi, I still didn’t understand why I absolutely need a lot of stroke for powerful low bass? What does it do for me if two subs have an efficiency of 90db@40Hz(only theoretically) which makes a 2cm stroke but the other only 0.5cm stroke???????? Both have the same efficiency… The one just needs more stroke to get to the level where the other hardly moves… Yes but what does this oh so great stroke bring me? I mean much prefer a short-hub chassis(alla PA) as a langhuber, because besides hip hop I also hear a lot of goa and techno.. Mfg Olaf