hello, is there a big difference from sound quality point of view and raw power between Yamaha AX-1090(or AX-1070) vs Yamaha A1000 ? Both AX amps series are 145Wpch - 8 ohms 20hz-20khz THD 0.01%THD and 18.3kg and the A1000 is 120Wpch - 8 ohms 20hz-20khz THD 0.005%THD and 13kg I'm asking because i read that A1000 is a powerful amp even if is just 13kg and 25 less watts but about the AX ones(just 1090-1070) i couldn't get too much info Manuals & full specs A1000 http://www.manualslib.com/manual/998440/Yamaha-A-1000.html?page=12#manual AX-1090(1070 has the same specs) http://www.manualslib.com/manual/197249/Yamaha-Ax-1090.html