Hi, my situation is that I have pioneer fs 52 speakers paired with a BIC F12 subwoofer. I researched somewhere that the pioneer speakers starts dipping around 60-70hz. I have an old pioneer receiver which can only crossover at lowest: 100hz. That is too high for my front speaker. Currently, I'm running the pioneer as full range paired with subwoofer crossovered at 70hz using the back of the subwoofer. Will it make a big difference if I buy a new receiver that has a lower crossover point ? Is there any difference between running front speakers at full range and adjusting the back of the subwoofer and using the receiver crossover ? Thanks !