Building on KRK’s legacy of sonic accuracy and performance, the new KRK S8.4, S10.4, and S12.4 subwoofers deliver tight, accurate, and defined bass, while their highly efficient Class D power amplifiers dramatically increase transient response, control, and punch. A wealth of connectivity options means you can hook up to practically anything without adapter hassles, and a four-position crossover frequency selection switch makes it easy to adjust the subwoofer setting to optimally match your existing monitors.