They will be used with my hi-fi set: record player, cd player, radio-tuner, cassettedeck and integrated amp.
The amp (Sonneteer) has no possibility to connect headphones directly, the CD player also not. The only possibility to connect headphones in my system is my Teac cassettedeck (yes, I am THAT old....).
That's why I started a search for a decent headphone amp to feed my AKG K400.
I made a (short)list, based on price and lots of reading here and elswhere:
Pro-Ject Headbox II
Firestone Cute Beyond
Some more €€...:
Pro-Ject Headbox SE II
Creek OBH-21 or 21 SE
Graham Slee Novo
Meier Corda Swing
or even €€€...:
I have no idea which one would work best, could you advise me...?