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The frequency refers to fundamental tones only. To give an extreme example a massive church bell such as 'Big Ben' will produce low frequencies you can feel in your gut and yet the harmonics will go way beyond the range of human hearing.
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i've seen this a few times in my recent research to build a system. the important part is harmonics. if you heard a female voice "bandpassed" at 90 - 1200 Hz or a piano at 27-4000 it would sound very flat. i believe phone receivers play only ~300-3400 Hz because thats the key range for human voice fundamental freqs. from a communications perspective (IIRC) 3.4kHz is the minimum channel separation between channels of multichannel radios, because that is the minimum bandwidth necessary to trasmit human voice.
this is also the primary reason i don't want a crossover in this frequency range in the active setup i'm putting together. currently looking at 4-8k for my mid-tweet crossover point.
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