A chain is only as strong as its weakest link.
it would be awesome, if you could give my your advice.
I’m currently using the following set-up and wonder what can be changed to improve it -- by minimizing the potential investment costs:
Spotify streaming (high quality: 320 kbps)
Fiio L9 (skipping the internal amp, but using the DAC of the iphone 4)
Epiphany Acoustics EHP-O2 Amp
AKG K-701 headphone
Thank you very much!