The Krell S-300i is a very neutral int. amp. It is not an amp if you want to add excitement to your system. If you find your music exciting the Krell will let you hear everything in the recording. From the tight well controlled bass to the wide and deep soundstage the Krell is for me.

The Cambridge Audio 640 was colored enough to impart a sound to most music. The Onkyo is a little cleaner sounding but is not the clear window on the sound the Krell is. Since the Krell does not impart any sound to the music each cd or record sounds unique.

All the reviews I have read mention that the S-300i is different from it's predecessors. The earlier Krell int. amps were reported to be thin sounding with lesser soundstaging so whoever designed the S-300i be it Dan or someone else I would say they got it right.