The Marshall Kilburn III has a decent frequency response accuracy. With the ‘bass’ and ‘treble’ controls set to their default ‘5,’ this speaker has a balanced, musical sound. It doesn’t extend as low in the bass range as larger speakers, like the Marshall Woburn III, but there’s plenty of thump and boom in the bass range to bring out the double kicks in metal tracks. There’s some slight over-emphasis in the mid-range that helps bring out chunky rhythm guitars and growly vocals, too. The treble range is very balanced, rendering sibilants, like cymbal crashes, in an even and pleasant way.

You can use the placement compensation function via the app to compensate for any reflections caused by being close to a wall or an edge, but we didn’t use this for our frequency response results, as we placed the speaker in the center of a table in the middle of the room. This graph demonstrates how these settings affect the frequency response in this positioning. We also took measurements with the edge setting enabled, with the speaker positioned at the edge of the table. There are a variety of EQ presets available via the app, too, which can be further augmented via the ‘bass’ and ‘treble’ controls. So if you enable the ‘Bass Boost’ preset, you can increase the bass even further by cranking the bass knob.