To understand why JiSS-600i exists at all, you need to look back to Griffin’s groundbreaking 2007 Evolve Wireless Sound System for iPod, a gorgeous metal and glossy plastic dock that Griffin was hellbent on doing right: with two fully detachable, rechargeable battery-powered speakers and a sophisticated wireless docking station with RF remote control, the materials and features chosen forced Griffin to bump the initial price of $300 up to $350,…