|Acoustics of the saxophone
Bb tenor saxophone
Notes are the written pitch.
At frequencies below about 1 kHz, this curve looks rather like that for A#4, but raised in frequency. At higher frequencies, however, the situation is complicated by the cut-off frequency. Here we have only two peaks that fall in the harmonic series: this fingering will bugle an octave, but no other note in the series. Above this frequency, the spacing of peaks in the upper part of the curve roughly equals that in the curve for the lowest note, A#3. This is because, at high frequency, the wave propagates past the open tone holes, reflecting only at the bell.
For general comments about the first register, see A#3. Compare with the impedance spectrum for a soprano sax on written B4: same fingering but sounding one octave higher.
This sound spectrum includes transient excitation from the beginning of the note, and so has traces of a subharmonic being excited above 5 KHz. For general comments about the sound spectra of the first register, see A#3, which is the first note of that register.
Sound spectrum of a Bb tenor saxophone played using fingering for B4.
For more explanation, see Introduction to saxophone acoustics.
You can hear B4 played.