I would imagine not everyone agrees with my approach, however, I have a Velodyne SMS-1 with the built-in parametric EQ that allows me to manually boost bass to some degree below that 50HZ level all the way down to 20HZ, BUT, one must make sure that the sub is capable of handling that extra thump. For the most part, from my calibrations in my particular set-up, a proper calibrated flat frequency response masks much of the 40HZ and below output requiring something to compensate for that loss and to be able to hear that "real deep" bass when it is part of the soundtrack.
