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Low Earth Orbit
DIY Audio
Semi/Anechoic Chamber self build
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<blockquote data-quote="Art Welter" data-source="post: 215140" data-attributes="member: 52"><p>Jordan,</p><p></p><p>The ASTM E413 curve allows +20dB transmission at 125Hz compared to 1250Hz. Depending on the low frequency SPL at your location, and the actual attenuation curve of the both you are considering, an attenuation of 30 dB may not reduce LF SPL to 30 dB.</p><p></p><p>Also, a small "anechoic chamber" will not be anechoic at low frequencies, it will still exhibit room modes.</p><p></p><p>Art</p></blockquote><p></p>
[QUOTE="Art Welter, post: 215140, member: 52"] Jordan, The ASTM E413 curve allows +20dB transmission at 125Hz compared to 1250Hz. Depending on the low frequency SPL at your location, and the actual attenuation curve of the both you are considering, an attenuation of 30 dB may not reduce LF SPL to 30 dB. Also, a small "anechoic chamber" will not be anechoic at low frequencies, it will still exhibit room modes. Art [/QUOTE]
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