Sound quality: The UE Hyperboom has Very Good overall sound quality. Bass has good impact and goes fairly deep, but is a bit prominent and somewhat boomy. Midrange is fairly even but is a bit hazy, grainy, and congested. Treble is fairly extended, but is a bit prominent and smeared, and lacks a bit of treble air. Does a good job of recovering room ambience, but sounds a bit congested. Bluetooth, optical, and aux sound quality are the same. Can provide a decent volume level in a medium to large sized room.