Audio from computer comes out with bass distortion (fuzz or clipping)

This just started happening, but it seems to affect every speaker system- the high end is OK, but the bass being put out by the computer is distorted, as if the "speakers" were being overdriven, but it occurs in all the output devices-my monitor speakers, my usb headset, and my tiny-jack headset, which seems to me to indicate that it's in the computer circuitry. Is there any way to equalize or adjust the signal coming out of the sound system?

I fixed it. False alarm. Thanks for looking. The problem was in iTunes. I had failed to mention that all the distorted sounds were coming out of iTunes. After I posted the original question, I tried trashing 2 of the 3 iTunes prefs-including the equalizer-then re-establishing my user ID. It worked. No more distortion, even on Tom Waits' Earth Died Screaming and Fannin Street.
Sorry for any wasted time.

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