Apple OEM left speaker assembly (part number 922-9821) designed for MacBook Pro 17-inch models. This replacement speaker unit integrates into the left channel of the notebook's stereo speaker system and connects via internal ribbon connector to the logic board. Compatible with 2006–2008 generation MacBook Pro 17" unibody and earlier aluminum models. Typical use cases include speaker replacement following hardware failure, audio channel malfunction, or system restoration. Tested and guaranteed; available via quote.