Quartorigo is a premium Italian car audio manufacturer based in Macerata, Italy, with roots dating back to the 1980s when an electronics enthusiast started building amplifiers in his garage. The company created the renowned Sinfoni brand in 1998 before registering Quartorigo in 2013 and retaining full Italian ownership after Sinfoni was sold. Every product is 100% handmade in Italy using carefully selected components, large capacitors, precise PCB design, and 24K gold-plated brass connectors. From the flagship Estremo amplifiers to the Heritage and Opus lines, Quartorigo represents the pinnacle of audiophile-grade mobile audio craftsmanship.
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