These small bookshelf loudspeakers are not only convincing because of their small space claim. We operate at the LF output of our PC with a small tube amplifier (SE 18 W). How could we tolerate only those puny tonearms semiconductor amplifier boxing for so long? The music playback is not only powerful, but in spite of the digital input signal is a full rich sound. A tip to anyone who wants to listen to music on your computer once. PS The sound is the way more clearly when you are seated decreases the aperture