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I don't understand the "not nearly as good" part.
They sound fine/great/pleasing out of a computer playing music files that aren't horribly lossy.
Adding a decent amp/DAC is nice but certainly not required to be happy with the way they sound. If in your personal opinion, an amp/DAC makes the 598 more involving that's perfectly okay, but it's silly to make it sound like the 598s are borderline unlistenable without all the fancy stuff.
1. I never said they sound "borderline unlistenable" without an amp / DAC, please don't put words in my mouth.
2. I said they sound fine, but not nearly as good as they CAN sound, what is hard to understand here? They will sound fine if you plug them into your computers motherboard headphone jack, a cheap mp3 player or a smartphone, but not nearly as good as they can when used with a good source and a decent amp that can power them properly. Why is that important? Because, if you're gonna buy headphones like HD598's, then you want them to sound like 250-300$ audiophile headphones, not like much cheaper headphones. If you're happy with how they sound without a good DAC and amp, fine with me, but you've just wasted about 100-150$, because that's how much money you could have saved by buying cheaper headphones in the first place, like HD449's or HD459's which would sound just as good as the HD598's, if not better, out of that same low quality source.
That was the point of my original comment in the first place. People buy these headphones and then they plug them into gear that's not even remotely capable of powering them properly of feeding good enough quality signal into them. I will repeat this for I don't know which time, just because it says "50 Ohms" on the box, it doesn't mean you can plug them into anything with a 3,5mm hole on it and expect good sound, because you will not get good sound. I will repeat again, these headphones (and that goes for HD558's as well) are virtually as demanding of a source as the HD600's, or HD650's, or K701's, DT880's, DT990's, or any other headphone in that sort of price range. All of those headphones will sound ok no matter where you plug them, they won't be unlistenable, but for their price, they will sound bad, and nowhere near their full potential.
Its like buying a huge 1080p hi-def plasma TV, and then watching 20 year old VHS tapes on it. Sure, the picture will be ok, but nowhere near as good as the picture can be if instead of a VHS you play some full HD Bluray discs on it.