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I'm looking into getting a DAC/AMP combo, is the Schiit Fulla good enough to run these comfortably or should I be looking at something else ?
That should be enough, my Xonar DG sound card runs them fine. On the high gain setting I can get a comfortable listening volume at 12% in Windows. These will sound a lot better on the Fulla 2 than on my sound card though.
You don't absolutely need an amp for these but it's recommended. A Schiit Fulla will work just fine.
These definitely need an amp. To hit their dynamic range target at minimum, 2 Vrms is required. Ideally, you'd want more power than this to ensure the drivers are being pushed as intended or else harmonics and transients will suffer. The low end will also tighten up quite a bit.
The other thing to keep in mind are the impedance spikes of this driver. While not identical to the 660S driver, they have a lot in common. As you can see here, the impedance spikes well over 400 ohms and typically remains above 150 ohm for most of its frequency range: https://www.innerfidelity.com/images/SennheiserHD660S.pdf. While these can be pushed to get loud with most sources, that doesn't mean you're extracting everything they can do or giving the drivers the voltage they need for proper control.
I've ran the 58X and 6XX from an iFi Pro iCAN in both balanced and SE thru tubes and SS amps and they "scale" quite well due to the resistance of the drivers and a powerful balanced amp. Member @Jackula can attest to this very well how this family of headphones can sound with proper amping.
Thanks for the mention, but yes agree absolutely these cans will shine with better amping, not just more power. Power and quality amplification will deliver these headphones to new highs. The 6XX's also have a smooth and grain-free presentation, which contributes to it responding very well to better amplification (not just more powerful amplification), as it is very transparent to the partnering audio equipment. Haven't listened to the 58X but suspect it would be similar. I've got a TOTL amp that is not only powerful (9W into 40 ohms) but also very high quality power delivery thanks to balanced power regeneration into dual mono sections of the amp, and the HD6XX sounds better on this amp than a Focal Utopia on a Schiit Ragnarok.
Thank you to everyone that replied with information. I've been looking at amps for a bit and can't decide on which one to get. I just know I want it to be all black to go with my desktop setup. If you have any other solid recommendations for someone like me that is new and looking for something to carry me a bit I'd appreciate it all.