A step-up from our Reference Series subwoofers, The SPL Series have best-in-class MAX output levels making them high-performance subwoofers at affordable prices. Cerametallic woofers are exceptionally light and extremely rigid, providing remarkable low frequency response with minimal cone breakup and distortion for higher, cleaner output using less amplifier power. The built-in, high efficiency amplifier features an analog preamp design, which maintains the original signal path for cleaner, true-to-source reproduction. The class D output stage ensures MAX efficiency for MAX output, detail, and low frequency power. Proprietary internal geometry that minimizes port Noise for clean undistorted low frequencies. The front-firing design allows for placement flexibility.