Since 1971, Sony has created products that have shaped the car audio industry. From the auto-reverse cassette player, towards the development of the in-car CD player, Sony has proven their innovation time after time again. In 1991, Sony released the famous "Holy Grail" Mobile ES line which took the industry by surprise. Now, Sony continues to innovate through the release of their modern high-end offerings such as the revolutionary RSX-GS9 audiophile-grade radio.