ProtoDAC TDA1387 X8 project

[OnkelPH]

As Mark posted " It still doesn't really matter." +++

You would be better to experiment with the output cap value related to the input impedance of the following stage and once set then adjust the value of the supply electrolytic for best balance (or preference) of sound-stage, depth, and bass response.

The ProtoDac has such few (such few..is that even proper English ?  so few !) components that it is easy to mix and match.
The module itself is cheap..buy several and and some perf-boards, Pi-Headers, and resistors and different value caps then play :-)
No need for ultra-uber-audiophile parts at this stage...once settled on the best match for your equipment then buy the fancy component values as found and be happy.

Good point. Luckily I got some second hand VCap ODAM 0.47uf that seems to be a perfect match with my Decware amp (100K impedance) On the input I’ve been using one Auduio Note Kaisei 2200uf for some months. 
The only place left to play with is the i2s….