Martin Logan BalanceForce 210 vs JL audio E112

If the JL can be calibrated to your room, it might be an option.  The Perfect Bass Kit (PBK) for the ML is essential.  Having the sub's output customized to your room is not optional, once you have heard it.

@noel89 Oh, if you have ML speakers you should definitely be considering a ML sub.  Beyond the PBK, ML provides custom cross-overs that match their various speakers.  I use the custom crossover that lets me run my CLXs full range, so that I add nothing to the CLX signal path, and the the sub just starts adding in bass as the output of the CLSs decreases as they go down in frequency.  I just looked quickly to see if they provide crossover files for the Motion 30s or 15s, but can't find any crossover files.  You might want to call them and inquire.