I do not understand why the software has a lower frequency limit unless the software creator chose to place a limit on the low frequency limit so as to decrease the response/update time. I would have expected a user option to set a lower limit, if one is desired, at the expense of response/update time.

I have a set of speakers that have response down to DC. I put in a big DC voltage and the (woofer) speaker responed by moving outward and then giving off a lot of smoke for a while. After that, it (the woofer) responed by just ignoring the input signal.

Paul