Usage of Meter By Sound Balancers
In order to use PPMs effectively in the control of sound levels it is necessary to understand the rationale and limitations of the design.
Although the PPM is preferred by many engineers to the much slower VU meter used in the USA, it does require some interpretation in use. Although it gives a useful warning of overload it does not represent either true peak level or subjective loudness. The BBC have tables showing recommended settings for different types of programme, such as speech, classical music etc., which attempt to take account of the latter.
Regardless of the kind of programme, there is usually a nominal Permitted Maximum Level, as indicated on a PPM. Operators are expected to keep levels below it within reason. Practices vary between countries and organisations. In the UK the Permitted Maximum Level is 8 dB above Alignment Level, corresponding to '6' on the British PPM scale. ITU-T standards for international sound programme circuits specify a Permitted Maximum Level of 9 dB above Alignment Level. Accordingly, +9 dB is represented by a mark on the EBU PPM scale.
Read more about this topic: Peak Programme Meter
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