Sound quality: Bose's S1 Pro had acceptable overall sound quality - this model reproduces music and dialog reasonably well despite the obvious shortcomings in its sound. Bass has good impact and goes fairly deep, but is a somewhat prominent and boomy. Midrange is fairly even, but is somewhat hazy and grainy and a bit echoey. Treble is fairly extended, but is a touch subdued, and a bit smeared, sizzly and papery. It does a decent job of recovering the actual room ambience from the recording but the echoey quality of the midrange adds an artificial sense of room ambience, and the overall sound is a bit congested. The speaker is monophonic. When two units are used as a stereo pair the sound stage can be made wider depending on placement. No significant difference between Bluetooth and Aux sound quality. Provides a decent volume level in a large sized room.