A step-up from our reference series subwoofers, the SPL series have best-in-class maximum 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 maximum efficiency for maximum 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. The Klipsch WA-2 Wireless Subwoofer Kit (sold separately) allows high resolution wireless connectivity for easy placement anywhere in your room and optimizes output and low frequency response. Connect up to four WA-2 wireless kits to compatible Klipsch subwoofers in a single room for a completely wireless connection. Low Pass Crossover and Variable Phase control allows you to tune the subwoofer to your Klipsch speakers and to your room, establishing the ideal level of bass. Line Level / LFE RCA inputs ensure compatibility with home theater receivers. Both the RCA and wireless inputs can be utilized, giving you the ability to use a single subwoofer with multiple system in the same room. For example, you can use the wireless input for your home theater set up and the RCA input for your 2-channel system, without needing to switch inputs when changing between systems. Exceptional efficiency on or off. Meets global efficiency standards - reducing energy costs for the user. Scratch resistant ebony finish looks like real wood and covers the entire cabinet.