Assertion: subwoofer's sound | /r/HasProperty | perceived at 7–8 hz
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Source sentences:
text: This suggests that for sound to be perceived at 7–8 Hz, the 7–8 Hz SPL would have to be 12.3 dB higher than the 92.0 dB SPL required at 15.5 Hz, which means that the 7–8 Hz SPL would require at least 104 dB of SPL to be perceived.