Good question. People always say "call a licensed electrician" like they never make mistakes. I always double check their work and often end up changing it. I grew up in the construction industry and knew a lot of people I wouldn't let change a lightbulb in my house.
Picture looks professionally done. 10 gauge is correct.
I don't know about the filters you used. (that is not a figure of speech, I literally don't know.)
But generally I would not put something like that on a high power circuit, i.e., my amp.
Are all 4 circuits on the same leg? (red or black, usually). that is a recommendation but not always important.
Jerry