The speaker seems fine for the job as the output from the mp3 line input sounds pretty good.
Changing the speaker would affect the sound from the mp3, not what I'm after.
Thanks for the suggestion.

The point is that the amp sounds fine at low gain but gets too dark past the midpoint.
On another note, I'd fancy a full tone stack EQ settings (bass, mid, treble). I'll see if I can find room for the pots (similar to the delay volume pot).

Does anyone have the schematic for the Blackstar Fly 3 mini amp?
I'm looking to make it sound a little brighter and don't know where to start.
Thanks