I know.
![Wink :wink: :wink:](https://cdn.head-fi.org/e/people/wink.svg)
It's a good set of headphone.
I'd have a look to another set for some different fun instead of up- or downgrading your dac/amp.
The headphone takes the most amount of the sound imaging, like speakers do.
A dac is only a small part of the whole. That's my 2 cents.
If you're not satisfied with your setup, go for a different sound by adding another headphone to your rig.
About the source.
What's the matter of your thoughts about a bottleneck in it?
Noone could answer this question untill an private audition, i believe.
![Wink :wink: :wink:](https://cdn.head-fi.org/e/people/wink.svg)
The best way is to borrow, maybe from a friend or an audio store, a different source device playing the same music files.
Only your ears could tell you the truth.
I for myself am not at the race adding several devices to the chain. Each device alters the signal a bit, imo.
But If you ask 5 people, you'll get 7 opinions, i guess. ^^
Welcome to the hi-fi, oh no, better call it audiophile world. Haha.
![KSC75 Smile :ksc75smile: :ksc75smile:](https://cdn.head-fi.org/e/headfi/ksc75smile.gif)
Don't hit me for.
Wish all the best experience listen to music.
![Headphone Smile :) :)](https://cdn.head-fi.org/e/headfi/smily_headphones1.gif)