Hi Scott, your favorable impression and selection of M5050 corroborates my own brief encounter with the same Miraphone eupho at the last ITEC in 2019.... Playing it mostly with a SM4U, I found it to generate a tone shimmering with harmonics.... Made me think it perfect in a sinfonic orchestral role.... While it readily spoke with a velvety voice with just a tiny amount of breath, it seemed to yield a heroic tone when pushed... My favorite euphonium at that event.
Next time I encounter M5050, I will try it out with DC4.
Regards, Guido
M5050L - DC2&3, SM2&4U, BT16, Carbonaria Heavy & New
Wessex EP104 Festivo - available
Carolbrass CCR7772 Bb cornet - Available