Altec Lansing 9845A is a high-quality monitor/playback speaker system designed for applications demanding extended frequency response, low distortion, and wide dynamic range. Its 15" bass driver delivers excellent low-frequency response, while the compression driver mounted on a sectoral high-frequency horn handles frequencies above 500 Hz. The speaker offers a switchable shelving adjustment from 0 dB to -6 dB in 1.5 dB steps, allowing for precise sound customization. Suitable for recording studios, mastering rooms, broadcast studios, auditoriums, and various sound reinforcement systems.