Available at HP Home, Logitech X-540 5.1 Speakers (model# FT893AA) features 140-Watt total output power (70-Watt RMS), 40Hz - 20,000Hz frequency response range, 5.25-inch 25W RMS subwoofer, magnetically shielded 15.4W RMS central speaker and 4x 7.4W RMS satellite speakers, 4-ohm impedance, remote control with headphone jack and separate master and bass level knobs, Matrix Mode for simulated surround sound from stereo source, more.