Now all is well. I live in an old building (from the 17th century) and is entirely built in wood (it is a wooden floor but you can call it wooden floor). The parquet (strips of 10 cm) rests on a screed made on a wooden slab which in turn rests on huge wooden beams (30x40 cm). Above and below are other apartments.
My solution was the one you see below the speakers (double aluminum plate isolated from each other)
My solution was the one you see below the speakers (double aluminum plate isolated from each other)