The hard drive on 7-series recorders generates nearly imperceptible noise levels, and it is the only device with any acoustical noise output on the recorders. Unless one presses his or her ear against the unit they will not be able to hear the drive during operation.

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Condition

Depending on several conditions, chiefly the microphone, the transformer-balanced inputs, such as those on the 302, 442, MixPre, MM-1, MP-1, and MP2, can get into an oscillating condition with a microphone that renders the audio unusable. This oscillation is often described as a "motorboating" condition since this low frequency oscillation sounds like a motor boat.

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w

Many test and measurement applications take advantage of the impressive bandwidth offered by the 722 and 744T analog inputs. Linear frequency response, particularly low frequency response, is needed for noise and vibration measurements. Linear high frequency response is useful when slowing audio in post production.

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There are many excellent articles (see links below) covering the basics of audio level metering — this is not that kind of article. This article moves beyond the basics to specifically discuss metering with Sound Devices 442, MixPre, and MP-2 portable products. A good general understanding of audio level metering is helpful before understanding the nuances of Sound Devices meters.
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