Works wonderfully well on a laptop

I have this Groundloop insulator (mass separation filter)
brought for my Toshiba laptop from 2007,
to the output jack of laptop music on my
To feed the amplifier. I do not know how the
is on newer laptops, but in my case was plugged
PSU always hum and whistle signal in the 3.5 mm
To hear jack output of the laptop.
(Indication of a ground loop to use various outlets did not help)
So I needed a mass separation filter.
This is easily to any point between Laptop
and amplifier (or boxes) connected to the phone cable
and what should I say:
It works flawlessly, it does not produce any disturbing noise more,

now it only needs good music ;-)