Logitechreg speaker system z623 for big bold 21 sound thxreg certified means quality you can count on these speakers have met strict performance standards to achieve thx certification yoursquoll hear and feel immersive audio from 200 watts rms of power that brings music movies and games to life multiple inputs as well as a built in headphone jack make it easy to get great sound from up to three audio devices easy two satellite setup and a powerful subwoofer give you bi