0.3 m (1 ft) or more. 1.8 m. (5.9 ft). 0.5 to 1 m. (1.6 to 3.3 ft). 1.8 ... 1 2 3 4 5 6 7 8 9 Automatic speaker setup. SOURCE ... (1 k Hz, 0.9% THD, 8 Ω). Front L/R ...
https://de.yamaha.com/files/download/other_assets/3/328053/RX-A3020_A2020_om_En.pdf