I'd be interested in trying this. I do want to amp, but would you say it's a waste with a 598?
I thought I had settled, but I'm still just stuck with the idea of getting a more musical headphone that will have moderate to good gaming performance or just rolling with the 598s. Been a hard choice, have been researching every day.
Do you find the 650's to work decent positionally? Does "immersion" feel good?
No idea why the 598's feel like this underwhelming choice to me - especially where I haven't tried them and my only experience are gaming headsets.
Sounds like from what you are saying this would be a good fit with the 600's or the 598's themselves?
I mostly got this because I wanted it to power my speakers too. For headphones only it is probably overkill.
I've never used the HD 600's but the HD 558 and 598 are very similar and are excellent for the money you pay. I still use my HD 555 a lot since the 650's are so hard to drive at 600 ohms.
You will be happy with 598s, they are a great choice for anyone. I prefer them for gaming when compared to my 650's, they are almost the perfect multi use headphone.
If you don't plan on connecting speakers then something like the Fiio E10K would be a great choice for a headphone amp/dac. Great value for the money.
That being said I don't think you'd notice much difference with the 598 on a soundcard you have or the dacs I mentioned.
I'd personally buy the headphones first and see if I'm happy, I think you'll find that you are and get a DAC down the road if you decide you'd like one.