Sound quality: Sony's SRS-XG500 had Fair overall sound quality. Bass has good impact and goes fairly deep, but is somewhat prominent, and slightly boomy. Midrange is fairly even, but is somewhat muffled and grainy. Treble is somewhat subdued and smeared, a touch sizzly, and the upper treble is muted. Does a so-so job recovering room ambience, and the sound is somewhat congested. When two units are used as a stereo pair the sound stage can be made wider depending on placement. Bluetooth, wired and USB sound quality are the same. Provides enough volume to fill a large sized room.