Logitech® Speaker System Z623. For big, bold, 2.1 sound. THX® Certified means quality you can count on-these speakers have met strict performance standards to achieve THX certification. You'll hear-and feel-immersive audio from 2 watts (RMS) of power that brings music, movies, and games to life. Multiple inputs-and 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 big sound-even in large spaces. And integrated controls put you in command-dial the volume and bass up or down to customize your listening experience. * These speakers have met strict performance standards to achieve THX® certification - for quality you can count on. * With 2 watts (RMS) of power, you can listen as loud as you want to. Youll hear - and feel - immersive audio that brings music, movies and games to life. * RCA and 3.5 mm inputs, as well as a built-in headphone jack, make it easy to get great sound from up to three audio devices. * Your powerful 2.1 system delivers easy, two-satellite setup and a powerful subwoofer for big sound - even in large spaces. * Youre in command with integrated controls - dial the volume and bass up or down to customise your listening experience.