Let me quote “Digital trends publications”
THE PROS AND CONS
The three most popular arguments in favor of separates are more power, better build quality and upgradeability. A dedicated amplifier is capable of delivering higher quality power and, usually, more of it. Since separates are aimed chiefly at high-end users, high quality parts are used in almost every aspect of the build. Pre-amps get better circuits, capacitors, potentiometers and processing chips, to name a few. Amps usually get bigger power supplies, more heat sinks and a better chassis. Also, since high-voltage (amplifiers) and low-voltage (pre-amps) applications don’t like to live in close quarters, putting them in their own rooms makes everyone happier. As for upgradeability, the idea is that you can keep the same amp or amps in perpetuity, so long as they are treated well and maintained, of course. Just trade-up your pre-amp to the next greatest thing and relax knowing your amp will handle whatever you throw at it.
The two most popular arguments against separates seem to be price and convenience. Separates on their own tend to cost a bit more -- all other factors being equal -- but then there’s the additional wires and power consumption that come along with separates. Plus, since processor technology is constantly evolving, it won’t be long until something comes out that makes a pre-amp go from state of the art to just art (which is still perfectly lovely, of course). If you are the sort of person who absolutely must have HDMI 1.5d (there is no such thing, by the way…yet) then as a pre-amp owner, you are going to be doing a lot of buying and selling and that’s just not convenient.
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