Having done this for over four decades, I have two ratings:
Analogue (i.e. vinyl, cassettes, radio etc.)
- Source: Up to 50% but notionally 30%
- Amplification: Up to 10%
- Loudspeakers: Up to 50% but notionally 30%
- Room: Up to 50% but notionally 30%
- Ancillaries (cables, stands etc.): Up to 5%
In summary, a roughly a third each for source, loudspeakers and room.
Digital
- Source: Up to 10%
- Amplification: Up to 5%
- Loudspeakers: Up to 50% but notionally 40%
- Room: Up to 50% but notionally 40%
- Ancillaries: Zero
In summary, it's mostly the loudspeakers and room.