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Do not use this unit within 22 cm (9 inches) of persons ... Do not use an 8 cm (3”) to 12 cm (5”) adapter ... – Firmly connect monaural 3.5 mm mini plug cables.
https://sg.yamaha.com/files/download/other_assets/2/328262/BD-S673_om_ABL-1.pdf
(GT-5000 | C-5000 | M-5000 | A-S3000 |. CD-S3000 ... 2.5 mVrms 52 k (56 kΩ). EXT IN. 1 Vrms 20 kΩ. Maximum ... - 3 cm aluninium dome tweeter delivers sound that ...
https://sg.yamaha.com/files/download/brochure/2/1246232/182LR_catalog_0830.pdf