Sound quality: Monster's Rockin Roller 360 had mediocre overall sound quality - this model has sonic shortcomings that leave a lot to be desired when listening to music but don't rule it out for dialog. Bass has decent impact, but is a bit prominent, somewhat tubby and deep bass is lacking. Midrange is somewhat nasal and plasticky and a bit hazy. Treble is somewhat smeared, sizzly and papery and the upper treble is muted. Does a so-so job of recovering room ambience, and is congested. The speaker is monophonic. Two units can be combined via TWS with the speakers separated up to 3 meters apart. No significant difference between Bluetooth and Aux inputs. Provides a decent volume level in a large sized room.