🔊 BlackLine Speaker Series Overview | BL10 • BL12 • BL15 🔊 In this video, we introduce the BlackLine BL Series — featuring the BL10 (10-inch), BL12 (12-inch) and BL15 (15-inch) passive speakers. Get a full look at their design, size comparison, and functionality from every angle. Whether you're planning for a home setup, small event, or professional use, this video will help you better understand what each model offers in terms of build and features.