Category: SPL

Understanding SPL metric “dB C Minus A”

Understanding SPL metric “dB C Minus A”

When measuring SPL, indicating the frequency weighting curve used for the measurement is critical. Below we see the A (orange) and C (red) weighting curves, the two choices you are likely to encounter on a typical SPL meter, thanks to IEC 61672. Although these weighting curves owe their creation to a failed attempt at emulating …

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A hidden consideration when choosing a mic and interface for SPL monitoring rigs

A hidden consideration when choosing a mic and interface for SPL monitoring rigs

One thing that doesn’t usually come into play for general measurement work, but is mission critical for SPL measurements, is headroom. This is a two-part concern. Max SPL To perform properly at concert levels, the measurement mic should be able to withstand levels of up to 140 dB SPL. Many measurement mics hit severe distortion / …

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SPL and Exposure data from nine shows I worked recently – here’s what I’ve learned from that.

SPL and Exposure data from nine shows I worked recently – here’s what I’ve learned from that.

This chart shows NIOSH exposure dose data for nine live music events I worked on in the last few months, sorted by performance duration (longer performances on the right). The data is stated in percent dose, with 100% representing the full recommended exposure limit for the day. Green bars indicate shows that I mixed (I had …

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