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The TTS28-A Active Subwoofer from RCF is a powered subwoofer designed for use in live sound, portable or installed AV systems, theaters, night clubs, and other applications. It is capable of 2,000-watts of RMS performance for up to 139 dB SPL. The TTS28-A has dual 18-inch speakers and a 4-inch voice coil. Its semi-charged horn design that acts as a conventional bass reflex cabinet for frequencies around 40 Hz while providing 3 to 4 dB of efficiency between 80 and 100 Hz. The TT28-A has a selectable crossover frequency, allowing you to select between 80 or 110 Hz.