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<blockquote data-quote="keep_hope_alive" data-source="post: 7716012" data-attributes="member: 576029">Arrival times don&#039;t shift frequency, just affect phase interference - I.e. amplitude.&nbsp; Peaks could be reflections.&nbsp; Those two peaks are likely constructive interference.&nbsp; If they are within 3dB you won&#039;t notice.&nbsp;&nbsp; We barely perceive a 2dB difference of single tones.&nbsp; My goal is to be within 5dB peak-to-peak in the vocal range.&nbsp; That results in a pretty natural reproduction.Also, test various mic positions.This is why measuring one diver at a time and saving each, has benefits.&nbsp; I still have the files for all my RTA tests.&nbsp; I can review and compare any combination, as many at a time as I want, and I can export to excel.&nbsp; I like TrueAudio, for $100 it&#039;s a good deal with 20 memory spots, and you can combine or create annother file for 20 more.&nbsp; Add a $50 measurement mic and you&#039;re only missing a preamp with 48V phantom power.&nbsp; Several to choose from.Note the laptop should run on battery during tests, chargers generate noise.USBpre is around $650 but it&#039;s **** good and good down to 10Hz.&nbsp; For work I actually care to measure as low as 5 Hz.&nbsp; But that low we use an Earthworks m50 mic.&nbsp; Below that we use a hydrophone which can measure below 1Hz.</blockquote>

[QUOTE="keep_hope_alive, post: 7716012, member: 576029"] Arrival times don't shift frequency, just affect phase interference - I.e. amplitude. Peaks could be reflections. Those two peaks are likely constructive interference. If they are within 3dB you won't notice. We barely perceive a 2dB difference of single tones. My goal is to be within 5dB peak-to-peak in the vocal range. That results in a pretty natural reproduction. Also, test various mic positions. This is why measuring one diver at a time and saving each, has benefits. I still have the files for all my RTA tests. I can review and compare any combination, as many at a time as I want, and I can export to excel. I like TrueAudio, for $100 it's a good deal with 20 memory spots, and you can combine or create annother file for 20 more. Add a $50 measurement mic and you're only missing a preamp with 48V phantom power. Several to choose from. Note the laptop should run on battery during tests, chargers generate noise. USBpre is around $650 but it's **** good and good down to 10Hz. For work I actually care to measure as low as 5 Hz. But that low we use an Earthworks m50 mic. Below that we use a hydrophone which can measure below 1Hz. [/QUOTE]

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