RM Italy 27/586 Low pass filters

[Turboomni]

Interesting as I saw a youtube video on RM Italy amps and he recommended a low pass filter to reduce TVI so your neighbors won't knock on your door. I also heard that amps over driven will cause this more than amps not over driven.
He also said RM Italy sells them too as you found out. Be interested in what the experts say about these things.