With many recordings, high level distortions at signal peaks may be audibly masked by the original signal, thus large amounts of distortion may be acceptable at peak signal levels.
2.
So, in addition to the main pulse, there are a large number of time sidelobes ( or, more precisely, range sidelobes ) present, the biggest of which are only 13.5 dB below the peak signal level.
3.
Broadcast engineers in North America usually line up their audio gear to nominal reference level of 0 dB on a VU meter aligned to + 4dBu or-20dBFs, in Europe equating to roughly + 4 dBm or-18 dBFS . Peak signal levels must not exceed the nominal level by more than + 10 dB.
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