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. Youll 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 big sound - even in large spaces. 400 watts peak power (200W RMS). THX certification with easy, two-satellite setup and a powerful subwoofer give you big sound - even in large spaces. Youre in command - dial the volume and bass up or down to customise your listening experience. iPod, . General information Model number: 980-000404. Manufacturers 2 year guarantee.