|Acoustics of the saxophone
Bb tenor saxophone
Notes are the written pitch.
This is the second note in the second register – meaning that it plays at the second peak on the impedance spectrum. It differs from D#4 (the corresponding note in the first register) in that it uses a register hole. This causes a leak in the bore that weakens the first impedance peak, but has little affect on higher peaks – see register hole for an explanation, and compare with D#4, whose impedance spectrum is almost identical except for the first peak. Above about 1 kHz, the curve is irregular: see the discussion in cut-off frequency.
Compare with the impedance spectrum for a soprano sax on written D#5: same fingering but sounding one octave higher.
Sound spectrum of a Bb tenor saxophone played using fingering for D#5.
For more explanation, see Introduction to saxophone acoustics.
You can hear D#5 played.