In 1989, due to the brand Lenco, one of the most important car audio brands in Italy, Paolo was already famous as an expert.In 1995, only for head units distributed in Italy including car cassettes, cd players, amplifiers, speakers, car accessories had reached 150,000 units per year.In 1997, was created Hardstone brand.In 1998, all ranges of products were distributed under the brand name.In 2001, the company HS AUDIO, which stands for Hardstone, was established.In 2013, Hardstone Italy and Hardstone Asia were established for in car multimedia systems and the brand has been registered in Italy, ASEAN, China and Taiwan. And it is going to be registered in many other countries all over the world.