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I have an audiophile friend that recommends using the C filter but in a "silent" room low frequencies are registering 50 dB or higher. I suppose that means my ear cannot hear them. And the relative change in dB once a barrier is constructed is what matters. I'm talking myself out of using the A filter as I type.
Use the C filter. For noise transmission data, use frequencies and amplitudes below 125 Hz.
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