SPL2 Technology limits sound pressure levels. What’s sound pressure? Sounds are essentially air vibrations—called sound waves, and these waves exert pressure. Larger waves exert greater pressure, which is measured in decibels (dB). With long-term exposure to high pressure, you can lose your hearing throughout time. A unique, proprietary innovation, dBLogic’s SPL2 Technology reduces this exposure by limiting sound pressure to 85dB, based on Occupational Safety and Health Administration (OSHA) and European Union (EU) guidelines.
Why limit at 85db? In the USA, OSHA has offered the guidelines here, while the EU has offered various guidelines that are very well summarized on this site, entitled "personal music players and hearing". On the basis of these guidelines as well as advice generally stated by audiologists, dBLogic has chosen to provide limiting at 85dB SPL.
Though limiting the pressure, SPL2 technology carries the clear sound you want to hear without distortion, clipping or interference. How, exactly? It modifies the original sound wave while closely matching the original profile.
Conveniently set in your headphones and earphones, SPL2 technology is the only battery-free and distortion-free SPL limiting technology on the market today.