Regarding the Krell 300i integrated amp, in my opinion this does NOT have the famous Krell sound and is really a mediocre amp/integrated amp. The 400 is a step up in performance though, but still a lot to be desired.
Since weight is such an important factor I doubt you will be able to replace the Krell sound of their older amps. The FPB and previous amps had great smooth sound, great bass and were actually quite airy in the mids and highs. Many people today seem to claim the Krells as being bright and edgy (which may have some truth with some of their newer stuff, especially the audio/video/home theatre stuff)but the amps of a slightly older nature are in no way producing this type of sound. I love the FPB series and while they are capable of carrying a highly detailed signal, they do not add glare and graininess (unless it is part of the signal it is being fed, which of course any good amp should do - vs. stomping on the signal by smoothing it out).
If I liked the sound of the digital/switching type amps, then I would recommend these based on weight alone (part of your requisite); however, I have yet to hear a digital amp that I could ever be happy with (please no bashing here, I have not heard them all).
Since weight is such an important factor I doubt you will be able to replace the Krell sound of their older amps. The FPB and previous amps had great smooth sound, great bass and were actually quite airy in the mids and highs. Many people today seem to claim the Krells as being bright and edgy (which may have some truth with some of their newer stuff, especially the audio/video/home theatre stuff)but the amps of a slightly older nature are in no way producing this type of sound. I love the FPB series and while they are capable of carrying a highly detailed signal, they do not add glare and graininess (unless it is part of the signal it is being fed, which of course any good amp should do - vs. stomping on the signal by smoothing it out).
If I liked the sound of the digital/switching type amps, then I would recommend these based on weight alone (part of your requisite); however, I have yet to hear a digital amp that I could ever be happy with (please no bashing here, I have not heard them all).