These speakers have met strict performance standards to achieve THX® certification - for quality you can count on. With 200 watts (RMS) of power, you can listen as loud as you want to. You'll 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. You're in command with integrated controls - dial the volume and bass up or down to customise your listening experience. 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 200 watts (RMS) of power that brings music, movies, and games to life. Multiple inputs-and a built-in headphone jack-make it easy to