super e cap

Dear,

In a private pre-amp re-design I'm struggeling with the output cap's. For now I try Blackgate NX HI-Q 47uF/6,3 volt in the ouput. It sounds phenomenal! beter then a 50 volt/ 47uF N series. But what bothering me is that the 6,3 volt is a (to) low value. The DC is already 2 volt. Do you think the 6,3 value is to low?

I'm curious about the super E cap config. But the capacitance doubled. So 2x 47uF in super E cap turn out in 94uF right? So is the comparison between a single 47uF and 2x super E cap fair? Tell me if i'm wrong.

Kind regards,

Bas