PO89ZB, an inline DC filter for SMPS wall warts. Preamps, HPA, Korg NuTube, etc

I already got an F4 built, amazing how nice it sounds coming off a tube amp, so very different, great detail, I wanna try it in bridged mode to figure if in that configuration I can squeeze some more dBs off of the JBL and if that works I would build a second one and convert both to mono-bridged and balanced 💪

Just remember that bridged amps ... do not like powering low-impedance spkrs; they need to be 8 ohms or above.
 
I'm interested in this schematic, but I try to use smd components.
And I'm glad to have suggestions from anyone, thx.

Try to add usb-C connect for rpi.
R1/R3 will use alloy current sensing smd resistor, and use smd caps.
R1/R3 將使用合金電流感應 smd 電阻器,並使用 smd 電容。

After finish, I'll release gerber file.
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