Nauc I have to ask...While that site is good for the information why do a subwoofer gain set with a 50hz? Everyone has been going to a 40hz for a long time now. Just being curious is all.
Also lots of us are now using tone generators via bluetooth that work flawlessly. Been doing mine that way since it came out and never an issue.
about the 50hz, if i had to guess, its right in the middle of 20 and 80. 20 being the lowest fq people usually can hear, 80 being the xover point a lot of people use
not sure if using 40 or 50 will really matter. both will probably give very similar results (or identical) unless you have a big spike in your fq response
about the tone generators, as long as its accurate.
and idk if bluetooth can screw up the accuracy. can it affect output? i have no idea