Recorders and Microphones
Euphonium is notoriously difficult to record with in a confined setting since it has SOO many overtones. Euphonium will often overdrive the microphones (regardless of gain setting). I had this problem with my Zoom H2. I found that when I record in a large room where I can move the recorder a good distance away from the horn and also get a longer distance for sound to reflect rather than a direct line from the bell, it works better. I also have a couple of old battery powered TEAC mic's that I used to use with a good cassette recorder many years ago. These work quite well.
Doug
Adams E3 0.60 Sterling bell - Prototype top sprung valves
Concord Band
Winchendon Winds
Townsend Military Band