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You can do a little experiment at home if you have instruments or songs/sounds with separate bass and another with super highs.
Record each with audacity or something - one pure bass and the other, something very short, high pitched, with a lot of attack, maybe shriek'y. (heck..you can probably record a youtube video of a bassy q300, and the other, a full uncatted no muffler test-pipe race set up).
Now look at the wavelengths of recorded results. Maybe zoom in and stretch it out. The bass will be much smoother, longer and flows. The high freq, attack sound, will be super short, peaky and sharp.
Now imagine these were actually physical and held it's shape passing through a cat. The cat will kill or smooth out the sharp, peaky, attack, high freqs (the rasp).
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