I decided on buying the e7/e9 dac/amp combo from fiio and I also noticed that I can return and upgrade my HD 598s to the HD 650s for about $70. The question is, should I? Will my listening experience sound better with the amp'd 598s or 650s? To round this question out. My plans are to use the e7/e9 as a desktop for home use, and the e7 by itself for portable use. Will the e7 by itself be better to power the 598s or 650s?
Also, I keep reading that amps improve sound quality, but I still don't understand how. From what I heard even the HD 800s can't sound very good, unless they're amped. Which baffles me. I thought it was because a DAC amp like the e7 basically uses an improved sound card so it sounds better. But now I'm reading that it's because there isn't enough power to drive them, which I don't really get what it means. I've been a music lover my entire life, but I am not just started to get into the business of picking the right equipment.