I had the Yamaha A-S 2000 and thought it had good bass was built like a tank but was slightly warm and thin through the midrange and treble and was a bit bright It reminded me of a Denon PMA 2000AE. I kept thinking designed for the Japanese ear which as I recall tends to like a brighter sound. I had the 801,700 and 500 and I think I liked any of those better then the 2000 . Makes me wonder where the A-S 1000 lies in that group soundwise.