I don't really think my AD900 changes all that much (and they are very similar cans) when I move them from a weaker source to a more powerful one. It's this reason that makes me think the ATH A and AD series would make great travel cans if you don't mind letting them have their own suitcase. That efficiency comes out to less equipment you need and batteries you kill.
Still, use that amp and see what you think. My impression when I moved them from my PCDP headphone out to a real receiver, the sound felt a little 'fuller', and maybe you will, too
. But really no less dynamic. I'm still surprised at how good they are out of my PCDP.
I didn't expect much difference when I connected my A900s to my PPA, and I didn't notice anything immediately obvious. However, when I switched back to the same source unamped after months of listening with an amp, I did notice a very minor degradation in sound quality, but nothing major. This surprised me, because I wasn't expecting any difference. I still couldn't tell any difference in back to back comparisons, but it just sounded ever so slightly different during long listening session without the amp.
I would say an amp is not worth it, you'd be better off spending the money on nicer headphones. You can always buy an amp for them later.
I have the A900 connected to a Turtle Beach Audio Advantage Micro and its plenty loud even when the software controlled volume is set very low. When I tried connecting it to my amp, I didn't notice any benefit. So IMO it depends on your source.
Head-Fi will be temporarily unavailable on September 16, 2021, for roughly 20 minutes for system maintenance and updates. This maintenance window will begin roughly at 11:00 PM ET. Thank you for understanding.