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RTA Pro measuring road noise: should I use the C filter or the A filter?
Forum Posts: 1
Member Since:
December 3, 2020
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December 3, 2020 - 9:19 am
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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.

Thanks all!

Chief Acoustics Engineer
Forum Posts: 629
Member Since:
August 12, 2013
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December 3, 2020 - 11:29 am
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Use the C filter. For noise transmission data, use frequencies and amplitudes below 125 Hz.

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