Audiokarma forum is your friend when discussing vintage audio components. I have no knowledge of these vintage Yammy's, but a quick google search of each model lead me to AudioKarma every time.
4 responses Add your response
" Was thinking about a used A-S 2000 integrated but have heard that it is pretty laidback?"
I can't speak specifically about the A-S2000 but I can about the A-S1000. IMO, it is far from laid back especially when you put the pedal down. Now you could say that it excels well with less energized music like acoustic guitar and folk/singer-songwriter female vocals but it will really open up with the likes of Rush or Steely Dan. Concert piano pieces sound like a big Yamaha Grand is right in your living room. I happen to be using very dynamic and efficient Klipsch RB-75(97dB) "bookshelf" speakers so that may be a factor here but recently hooked up a small pair of Polk Audio RT25I(89dB) bookshelf speakers and they held their own for what they are. Nowhere near as energetic with the Polks but that was to be expected. Just bought the matching CD-S1000 and that added even more listening pleasure to my rig.
"Interesting Just concerned about being soft for Rock and blues"
Listened to a little SRV last night on my A-S1000 and "soft" is not what I was hearing. Thumping bass lines and a screaming Strat with serious authority. Never fell apart even at near ear damaging levels. Again, my RB-75's play a huge roll in the loudness and very low distortion.