If you experienced hiss noise from the loudspeakers using Fenice20, follow this instruction to fix it:
Remove the capacitors C7 and C8 (100NF 0805 ) and solder them in the places C31 and C32. See at fig #1 the wrong situation, and the fixed one, fig #2.
We apologize for this inconvenience, we are contacting our customers.
Fig #1 (wrong, remove the capacitors as indicated by the arrows )
Fig #2 (fixed, solder the capacitors as indicated by the arrows)