Product Information: The S10.4 powered studio subwoofer builds upon KRKs legacy for sonic accuracy and performance. The custom-voiced, glass-aramid woofer delivers tight, defined bass, while the Class-D power amplifier dramatically increases transient response, control and punch. The four-position selectable crossover makes it easy to adjust the subwoofer setting to your existing monitors. KRK's S10.4 subwoofer doesnt just deliver precise bass and a rich feature set: its the next dimension in subwoofer performance. Product Features: Warranty period: 3 Years 10" glass aramid composite woofer Bass extension to 27Hz with a max SPL of 117.2 dB Footswitch control enables/disables sub and crossover filter (footswitch not included) Redesigned cabinet with a lower profile and front-firing bass port Powerful, lightweight Class D amplification Optimized four-position crossover control Universal connectivity: XLR, 1/4" TRS, and RCA inputs and outputs Polarity and input sensitivity controls Ground lift switch prevents ground loops For more information and specifications, please refer to the manufacturers website