Leveraging a 10" spun copper Cerametallic woofer and high-efficiency Class-D amplifier, the Klipsch SPL-100 subwoofer delivers best-in-class low-frequency output. 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 maximum efficiency for maximum output, detail, and low frequency power. 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. Klipsch Cerametallic cones are matted to a dual-layer, copper-wound voice coil for exceptional conductivity. Reference Premiere woofers are housed in a non-resonating, stamped-steel basket that’s secured to a large magnet motor for exceptional efficiency and low distortion, and matched to the horn-loaded tweeters for optimal acoustic execution.