Get the most from your computer games and DVD movies with Logitech’s Z-640 surround-sound speaker system. The system’s four satellites (left/right, front/surround) and center-channel speaker fill your room with sound, while the 25-watt powered subwoofer rounds out the bottom end to a deep 35 Hz, a good octave below the range of most bookshelf speakers, delivering floor-shaking bass from your music or a DVD’s low-frequency-effects channel, the “. 1″ in a Dolby Digital or DTS 5. 1-channel presentation. Inputs include a stereo analog (left/right) RCA pair and multi-channel analog inputs for decoded surround sound from any four- or six-channel sound card (or audio/video surround receiver). The satellites are powered by 7. 3 watts each, and the center channel, which handles up to 70 percent of most surround mixes, gets 16. 3 watts. Logitech’s innovative, dual-chamber subwoofer delivers twice the bass energy of similarly sized subwoofers, and the company’s use of an internal …more