Mix preparation, the foundational stage encompassing technical, musical, and organisational tasks preceding creative mixing, remains under-examined despite professional acknowledgement. This study investigated whether preparatory effectiveness operates through compensatory relationships, where excellence in one dimension offsets weakness in another, or through threshold requirements demanding adequacy across all dimensions simultaneously. Professional mix engineers evaluated twenty-seven prepared sessions spanning nine genres, with
assessments across five dimensions derived from practitioner interviews. Results revealed consistent noncompensatory patterns: exceptional performance in isolated dimensions failed to compensate for failures elsewhere. One practitioner achieved perfect `Workflow Facilitation` (5.00) yet overall `inadequacy` (3.43) due to `Signal Integrity` failure (2.50). Another achieved strong `Musical Refinement` (4.75) whilst `Workflow Facilitation` collapse (1.75) produced a below-threshold outcome (3.49). These patterns held across all inadequate sessions. The findings challenge three assumptions: that practitioners can specialise and compensate, that education can sequence skills for later integration, and that intelligent systems can optimise tasks independently. Preparatory `adequacy` requires meeting threshold standards across all dimensions concurrently.
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