The Yamaha NS-1000 was the top model in their Natural Sound line of 1977. Very good sounding, they were reminisce… | Yamaha audio, Vintage speakers, Audio amplifier
Yamaha-NS1000
Yamaha NS-1000M 3-Way Loudspeaker System Manual | HiFi Engine
stereonomono - Hi Fi Compendium - 13 years on-line: Yamaha NS-1000 M Monitor