When it comes to headphones, the type of cable matters. Usually, the type of cable used for the headphones will make only a subtle difference, but choice of cable is still something to think about. Blogger Tyll Hertsens tests and reports on use and measurement of six different types of cables.
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Headphone cable measrements. WOW !
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I’m seeking info for sanctuary reverberation absorbsion material ( panels) and best placement.
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?