It might be used to refer to RMS amplitude, or it might be used to refer to "having higher sonority" but that requires a standard of comparison to be meaningful. Now: you use the term "sonorous", but unfortunately that is only marginally a term in linguistics. Turbulence is kind of orthogonal, though it's hard to have turbulence with a really open vocal tract. What allows voicing is trans-glottal pressure drop a trans-glottal pressure drop requires a sufficiently open vocal tract that oral air pressure does not become too high. This does become a zero sum game with stop, which can sustain voicing only for a short time until supraglottal pressure rises to the point that voicing stops. There are a number of accommodations possible with a voiced fricative, such as lowering the larynx, raising the velum, slightly opening the velum, moving the constriction forward. Taking as one example of a voiced obstruent, because of the lingual construction, spontaneous voicing is not possible, but voicing is (see SPE p. Without such active spreading, there would be vocal fold vibration. So, one can spread the vocal folds when producing a bilabial nasal, and satisfies the criteria for being. Sounds that have high sonority likewise are not necessarily voiced, for the same reason.
A sound need not have vocal fold vibrations, because that is controlled by separate features governing the approximation of the vocal folds. "Sonority" is a less-well defined concept, but is approximately equal to the inverse of resistance to airflow – as such, it is not a binary property but sub-classifies sounds along a scale of at least 5 points (probably not a continuous scale). Thus vowels, glides (including, liquids and nasals are, anything else is. 300-301 for discussion of the latter concept. A sonorant is a sound produced with a vocal tract cavity configuration where spontaneous voicing is possible: see Chomsky & Halle 1968 The sound pattern of English p. There are three linguistic terms which have a common Latin origin, sonor: "sonorant", "sonority" and "sonorous".
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