Coupling Capacitor upgrade? Which one first?

I really like Cornel Dubilier over Wima's.

Cheap, small. Worth trying.

RIFA 450 are inexpensive and better than Wima. But try 3.3uF and 4.7uF Jupiter Copper foil wax if you want the best.

Still I don’t understand why wima caps aren’t good enough.

They are, I would suggest save the money and look for a "direct coupled output" dac with TDA1541 or better still PCM1704 even 1702.

Cheers George 

Second thought, since you have a non polarized 63v cap on the input of the amp, just bypass the one on the dac (direct couple it) there’s no need for it, at least you get rid of one "pita" cap.
But make sure you power up the dac first then the amp.
And turn off amp first (wait) then turn off the dac.

Cheers George

George actually I tried to change The dac output caps with wire. Not too much change. (just a feeling some thing removed :)
Because of this, I started to think amplifier input cap more important than dac output caps(>>>>).
But you guys more experienced than me probably. Maybe someone has similar experience or explanation..