I picked up the Gold 5's just before Christmas; I am running them hooked up to SMSL SU-8 DAC, with laptop as USB source for CD-quality FLACs.
If your looking to add a dac at reasonable cost the smsl m3 has 3 inputs and a headphone section for about 70quidPs, Nobsound have such a good rep, I’d rather happily pair the Preamp,with more expensive Actives.
No reason at all not to add a decent dac to it either.
I’m considering getting one to experiment with my Adams.
If I do I’ll report back.