FYI: PS Audio 老闆 Paul McGowan 新推出的音響工具書

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1. https://www.psaudio.com/products/reference-music/
9-1-2021 The Audiophile's Guide: The Stereo (Book 1 of 2)

2. https://www.psaudio.com/products/the-loudspeaker/
30-9-2022 The Audiophile's Guide: The Loudspeaker (Book 2 of 2)