A big part of this is personal preference for what kind of sound you want. You can definitely get the lush and liquid coloration of Class A amps. Or go towards the unique (but not accurate) coloration of most tube amps. In either case, it’s what makes you feel good.
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That being said, I have been able to obtain a VERY accurate and very musical system. This is a lot harder than it sounds. It is very easy to put in a forgiving "Class A" or other warm sounding amp and have things sound good. But it is extremely difficult to make a "very accurate" system sound good. There is a "fine line" that you are chasing here where you need to get enough accuracy to make the instruments/voices sound "real" and "in your room" without crossing that line into the "too harsh" and "too sterile" area. A good analogy to this is the sharpness adjustment on your tv. This can definitely increase the sharpness and crispness of your image, but if you push it too far, it can easily become over-sharp where it’s just painful to look at. In my system, changing a single fuse can be enough to "push it over the line" into too fast/bright.
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That being said, I have been able to obtain a VERY accurate and very musical system. This is a lot harder than it sounds. It is very easy to put in a forgiving "Class A" or other warm sounding amp and have things sound good. But it is extremely difficult to make a "very accurate" system sound good. There is a "fine line" that you are chasing here where you need to get enough accuracy to make the instruments/voices sound "real" and "in your room" without crossing that line into the "too harsh" and "too sterile" area. A good analogy to this is the sharpness adjustment on your tv. This can definitely increase the sharpness and crispness of your image, but if you push it too far, it can easily become over-sharp where it’s just painful to look at. In my system, changing a single fuse can be enough to "push it over the line" into too fast/bright.