Gemini GVXSUB12P Active 12-Inch Painted Subwoofer 250W RMS 600W peak 12" woofer with 2.0" (50.8 mm) voice coil and 50 oz.. Magnet Electronic crossover w Adjustable frequency control Built in amp with limiter circuit Built in amp with limiter circuit, 300w rms Adjustable frequency control and electronic crossover. It has a built in amp with limiter circuit and 300w rms.