All-in-one Solution – With a built-in internal 8-channel amplifier and High Resolution processing (96kHz/24Bit), the Alpine Optim8™ is the all-in-one solution to amplify and sound tune a factory or aftermarket head unit. Real-Time Sound Tuning – The Alpine Optim8™ features automatic sound tuning through PC App or IOS App for the iPhone that guides users through quick and simple measurements of their factory or aftermarket sound system. Guided motions on the app instruct the user where to place the external microphone (KTX-CSP1 Tuning Microphone for PC, sold separately) or built-in mic on the iPhone in the front cabin of the vehicle for accurate measurements.