hi guys my s17 has arrived yesterday.. o gosh this is the amp, i love it from the 10 second i listened. i'm a musician and an audiophile from 30 years and it takes few second to decide if something worth or not, for example having listened to ef400 in one minute decide to re sell it. this amp is wonderfull, sound wonderfull, the sound is spread well, instruments are well layered and they keep their right timbre and the attack of the sound is correctly fast,crisp, you feel the energy of the musician a lot of micro details (texture) and its a not a warm sound , rolled off somewhere, and the reverb the sense of space is great. i listened to all these increasing in quality, driving it from just a rca cable coming from a ifi gryphon so imagine what can i obtain with a better dac trough an xlr cable. now i'm looking for the sibling dac to this, to drive with the maximum magic my he1000se but 2/3 of the road has passed! buy it with confidence, thanks Giangi to having sold it to me