Hi G,
I would not recommend using lower cap values then what is in there stock. Best to look elsewhere or a different product range that does have the same(or slightly higher is okay) capacitance value. Getting a higher voltage rated cap is recommended though
But to answer your question if it will have much effect, I can't say!
I can't recommend enough the AmpOhm alu or tin pio caps. Has to be one of the best value caps I know of now. I read on another thread you have some 2.2uF coming for your dac. Great stuff
Be interested to hear your impressions of how they compare to the Obligatos.
Trying the 3.3uF instead of the 2.2uF will be fine if they are used as output coupling caps (just before the output rcas).
Best,
Tuyen