It would be rather silly of them to create a bipole that cancelled itself out, wouldn't it? Might as well make it a monopole then...otherwise the midbass drivers serve no purpose. The drivers appear to be at enough of an angle (looks like about 45deg actually) from one another that they will not...
-3dB at 65Hz means the S50s do not have a tremendous amount of bass, not the kind you will really feel from a distance anyway. The center is -3dB @ 50Hz, which may give you a little more oomph, but not a ton and with it being only one speaker, it may not be enough. The speakers I run are all...