so my fft is working for notes 8b-1G# so from 7902 Hz to 51.91 Hz after that it says 46.25 Hz is the same 49.00Hz : notes 1F# and 1G. it then says notes 1E and notes 1F are the same (41.20Hz, 43.65Hz) I am using this site : http://onlinetonegenerator.com/?freq=5000 to product the sine-wave and my roommate has a really nice surround sound system to play the Frequencies... I hook my ipod up to it and was able to play the sine-waves so is this normal ? I know 49.00Hz was really low... also how low of a Frequency can I play on a surround sound system before I misses up the speakers ? or my ears ?