An octave above the alto.
The smallest saxophone in P. Mauriat's range, the PMSS-50SX. It has a lovely, lilting timbre, much bigger in its frequency spectrum than is expected from a horn this diminutive. Intonation on an instrument of this pitch is often fraught with peril. Not so with the 50-SX. Intonation here is spectacular all across the range of the instrument. Speaking of spectacular, most professional sopraninos are prohibitively expensive, and while this one isn't likely to be purchased on a whim, its pricing is much more in line with what a working musician can afford on a horn that is not primary in his or her literature.