Subwoofer plays combination tones

Mar 25, 2018
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I have always thought my new sound system sounded a bit off, when I play music for example; the sub produces strange low rumbling sounds, even if the music has no low frequencies. I discovered why; by playing 4000hz against 3950hz it produces 50hz. The SUB produces 50hz, I repeat; the SUBWOOFER is playing combination tones. Why is my sub breaking the laws of physics? 2 dissonant tones of 4000hz does not actually produce a new low tone in reality. I suspect it's probably some sort of weird amplifier thing, or something going wack in the band seperator. Any help is appreciated.

LOGITECH Speaker System Z323
Sample: https://www.dropbox.com/s/subbisj1omxj6vv/DR0000_0168.wav?dl=0
 
Mar 25, 2018
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I know what beating is. The resultant frequency difference between 4000 and 3950 manifests as amplitude modulation, not as a non-existant distortion tone that then plays through my subwoofer. I don't think you completely understood the problem.
 
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