@millercarbon I do not dismiss advice... I will not use paper because we own already the 2 protractors, and my printer does not print very thin lines which I know I need, but not because I want to ignore advice :)
At home we like to keep things simple, specially on our hobbies. What is the point to stress about something it is supposed to bring pleasure.
Thank you for the advise on the isolation very much, to be completely frank I keep forgetting that my house in the US is built out of wood sticks and plaster. The first time I tried to hang a picture, the nail disappeared 🙄! and now that my audio rack is about 350Kg, when I walk the subwoofer cone wants to go for a walk and leave the enclosure behind so I am hoping your suggestions help.
I also will have put some bars between the soil and the floor for support, like lifting a car, with the hope that will help.