I’ve owed all 3 models, well not exactly (I had the Accuphase E-600). They are all great amps but have “personalities” of their own. Much has do do with what the rest of your gear is, music preferences and what type of sound is important to you. I’m not sure any one of these three are better than the other two. I would say they are different.
Based on my experience, I have found the Luxman to be the best value by far and probably has the smoothest sound. The Diablo 300 has a strong authoritative command of the low ranges but can in some cases, be a bit harsh on the upper frequencies. The Accuphase E-650 is supposed to be much better than the E-600 but I have not heard the new model. Accuphase seems to be a bit more dynamic in presentation than the Luxman. Class A does have a certain magic to it so the Accuphase and Diablo 300 (at least for the first few watts) have the Class A magic.
It’s all about synergy though and the incorrect choice of cables and/or interconnects and other components could yield less than optimal results. Try to find a dealer that would allow you to do an in home trial for a few days.
You can’t really go wrong with any of the three.
Based on my experience, I have found the Luxman to be the best value by far and probably has the smoothest sound. The Diablo 300 has a strong authoritative command of the low ranges but can in some cases, be a bit harsh on the upper frequencies. The Accuphase E-650 is supposed to be much better than the E-600 but I have not heard the new model. Accuphase seems to be a bit more dynamic in presentation than the Luxman. Class A does have a certain magic to it so the Accuphase and Diablo 300 (at least for the first few watts) have the Class A magic.
It’s all about synergy though and the incorrect choice of cables and/or interconnects and other components could yield less than optimal results. Try to find a dealer that would allow you to do an in home trial for a few days.
You can’t really go wrong with any of the three.