Martin Logan BalanceForce 210 vs JL audio E112

My setup its a 5.1 with the ML motions 30's and the 15's. Also I have not done the PBK yet. Going to see order it and see how much its going to improve the response. 

Looking at the specs of the e110 and the e112 its 25 Hz and 22 Hz can they really go much lower? 

Well, maybe. My Sunfire 12" is rated down to 16Hz. at 116dB in a room. To me, the e110's go lower than the Sunfire. Since you have ML's, maybe you want to stay with ML subs to match. The PBK sounds like the first logical step.

@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.