After using for 20 Amp Luxman L435 a year I decided to upgrade my hifi. After one month of use, the Pioneer A9 appears to be a marvel.
Quasiement no buttons, and output sound and not tampered with in line with what the artist wanted to get into a recording studio. I chose this model after comparing several NAD (not bad) and Denon. In the end, the association with the player A6 of the same brand and Bose (301) turns out to be a very good surprise. The music is clear, the sound is balanced, the stereo effect amazing. In short, I advice that material. That said, keep in mind that the resulting sound is always the combination of the amp, the source (CD player very often) ... and the speakers in the room. This model costs € 990 or € 490 more than the amplifier A6 of the same brand. It is expensive for 10 watts of powerful and more. But do not regret buying it for last 20 years, and A9 do not go out of style.
+ Outstanding quality manufacturing
+ Outperforms many more powerful amp