Some people think of A-weighting as "voice" and C-weighting as "music". Note in the graph below that A weighting removes a lot of energy in the low frequencies, as well as attenuating high frequencies, while C removes much less of the lows, and still some highs. A weighting is simply a filter, or set of filters, that alter the effect of certain frequencies on the reading. The overall SPL level usually has a weighting applied to it. This mode is available in SPL Pro, SPL Graph, and SPL Traffic Light. So an Leq10 will typically be the average SPL level over 10 minutes. Leq simply means an SPL average over time.
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It will vary as the sound in the room is louder or softer - unless, that is, you are in Leq mode. This value is dynamic representation of the overall sound level in the room. The most common measure is a simple overall, or wide-band, SPL dB value. We will try to explain these differences here. A number of these include SPL dB values, and although they may all be displayed as a single numeric value, they may mean different things, or have different values.
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Troubleshooting In-App Purchase and Standalone App Issues.Belgium, The Netherlands, and Luxembourg.LARSA - Loudspeaker And Room System Analyzer.