Meters which measure the very peaks of signals are very useful in digital recordings, as digital systems should never be clipped. To obtain RMS levels, programs like Cool Edit Pro can be used to analyze a section of waveform. 94 dB for the peak level, both relative to a full scale sine wave. For a noise measurement to be valid, a bandwidth must be specified. This is often a point of confusion when looking at different products specifications.
Power is basically the energy from each of the measured frequencies all added up.
To compare apples to apples, noise measurements are bandwidth-limited to something. This is very important. For instance, our Audio Precision test stations can measure signals to beyond 500 kHz. If we bandwidth-limit this signal to 22 kHz, it measures 82 dBu. A flat noise measurement would not correspond well to how a human ear would perceive the level of noise of the converter.