Key points are not available for this paper at this time.
Even if sound measurements are made over a very wide dynamic range, say from 0 dB to 180 dB, the applied instruments are typically tested only at one level, which is most often within the range between 94 dB and 124 dB. Is this enough? Some types of microphone have probably never been tested at medium and high levels, as neither standardized nor generally agreed methods are described or available. However, today aerospace organizations, accreditation bodies and laboratories performing pattern approval of instruments ask for documentation, methods, and test equipment. Therefore, B&K decided to develop a system for generation of sound pressure over a wide dynamic range for routine testing of measurement microphones and pressure transducers. This paper describes the design and the properties of the system, which generates high pressures by a system of coupled tubes with standing waves. The general operation principle is not new, but the system, which can operate upon an ordinary laboratory table, is refined and optimized for a generation of levels as high as 174 dB at 500 Hz with a very low distortion (attention is paid to third harmonic distortion, which indicates lack of linearity).
Erling Frederiksen (Thu,) studied this question.