It's not about what you hear, but what you feel. LFE channels are increasingly carrying information below 20Hz, in order to transmit the full effect of explosions, that helicopter blade "whump", and other movie effects.
And you can hear below 20Hz, it's just that most amps and speakers aren't powerful enough to play them loudly enough.
The Cobra Tag may help you win that losing battle, acting as a Bluetooth device that attaches to your key ring and connects to your phone, it gives you the opportunity to find the missing item if it's less than 30 feet away.
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It's not about what you hear, but what you feel. LFE channels are increasingly carrying information below 20Hz, in order to transmit the full effect of explosions, that helicopter blade "whump", and other movie effects.
And you can hear below 20Hz, it's just that most amps and speakers aren't powerful enough to play them loudly enough.
http://www.rotarywoofer.com/howlowcanwehear.html