News Summary

• Researchers from Pennsylvania State University have created a 3D-printed speaker cover that can focus sound waves to an astonishingly small point.
• The device works like a convex magnifying glass lens that focuses light into a narrow, concentrated beam.
• The researchers believe the technology could find applications anywhere private, localized audio is desirable.
• Potential use cases include ATMs, kiosks, museums, and automobiles, where multiple occupants could listen to different audio streams without interfering with one another.
• Before anyone starts eyeing their 3D printer and a Bluetooth speaker, it is worth noting that the technology is not a universal attachment that can transform any speaker into a privacy-focused audio system.