What are the numbers I receive means during the Frequency Domain work? Patrick Vlaskovits October 16, 2017 20:02 Follow Every bin represents a range of frequency. Magnitudes are the amplitude values of each frequency bin, phases are phases. Related articles Can I do a power spectrum through superpowered sdk? Does it make sense to apply a filter before I am in the frequency domain? We currently fetch audio from iPhone’s in-build microphone and on it we have to apply FFT filtering. I'm curious how I would go about adding the mono input (received from SuperpoweredIOSAudioIO by setting numberOfChannels to 1), or if I should combine the stereo channels at some point before or after the FFT. Comments 0 comments Article is closed for comments.