Sound quality: Marshall's Kilburn II had Good overall sound quality - this model reproduces music and dialog reasonably well despite the obvious shortcomings in its sound. Bass has good impact but is a bit prominent and boomy, and doesn't go deep. Midrange is somewhat grainy, and hazy, and a bit thin and nasal. Treble is extended but is smeared, sizzly, and glary. Does a so-so job of recovering room ambience, sounds somewhat congested. There is no significant difference between Bluetooth and Aux sound quality. Provides a decent volume level in a medium sized room.