The author is obsessed with headphones for several reasons. The personal feeling of it as no one can listen to the headphone but you. Loud speakers aren?t as personal. Also you can control the volume to your liking and satisfaction. It also is convenient since it allows to listen to music that others may not want to.
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Help! I’m Turning into a Headphone Crazy – Audiophile Review
There may be apps that do that. You can definitely find spectrum analyzers that will measure ultra low.
Is there an APP that can measure the ultra low frequency levels?
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