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Well so I think that I'll go for the hd598. But, if you think that e9 can drive all those headhpones, so do you think that I will better buy for example the dt880 and fiio e9? Because a lot of people tell that headphones like hd600, dt880,k702 need quite expensive amp (around 500$) which is way over my budget right now. But, I can certainly afford 100-200$ amp.
I would just stick with the 598 for now. There are better headphones than the 598, but they're much more picky about amps and often seem harder to like. I don't suggest the DT-880 unless you know what you're getting into. Some love it and some hate it. I personally like it, but the HD-598 is more fun to listen to. To me the DT-880 is just a side-grade kind of, but it does many things better than the HD-598, but for me isn't as fun to listen to. I also just prefer the mids on the HD-598 as well as it's soundstage. I must be the only one in the world who found the DT-880 uncomfortable.
The HD-600 is better in many areas compared to the 598, but it all comes down to preferences. The sound of the HD-600 is VERY slightly more clear, but on the stock cable has less treble (to me) and less forward mids. The HD-600's soundstage is much smaller and not nearly as good for gaming. HD-600 felt far more laid back than the HD-598.
The HD-650 is a huge upgrade from the HD-598, but it's very picky about amps. I didn't like it much from my $200 Asgard or E9 much. I think I'm starting to love it now that I got a better amp than the Asgard and E9.
I think between the HD-650, K702, HD-598, HD-600 and DT-880, the HD-598 is the easist to like. Maybe the HD-600 too, but it all comes to down what genres you listen to.
Another good alternative to the HD-598 is the K601, but it needs an E9 at the bare minimum. The K601 is $190 or so and it's signature is similar to the 598. I haven't decided which one I like better yet. K601 is very picky about amps it seems. The sound signature of the 598 feels a bit more smoother and easier to listen to all day. K601 might be slightly less laid back and maybe a little brighter. Both are very non-fatiguing I think.