Bluetooth to 7237 questions

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A few questions
I put this on a breadboard and it functions - the Bluetooth is noisy but I attribute that to the mock-up. The two caps are 10uf electrolytic that came with the Bluetooth module - there were zero instructions- the caps are allegedly wired in the signal path, it works but sounds thin. The board alone sounds great- the questions;

What about those caps? Needed? Better options?

If I use rca and 3.5 inputs can I simply wire them in parallel- being cautious to only use one at a time. I will use a dpdt switch when going from Bluetooth to ?line signal.

The psu is from a laptop with a handy 5v and 12v
 

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