A theoretical and experimental study of acoustic pertubations interacting with a turbulent subsonic air flow inside a circular cross-section duct (length 3000 mm and diameter 50.8 mm) was performed. Sinusoidal acoustic perturbations are introduced in the flow at resonante frequencies of the pipe, namely 56 and 112 Hz. For the undisturbed flow, static pressure field was measured by means of standard techniques. Measurement of pressure field in the disturbed flow condition is a difficult task and requires more sophisticated methods. A concentrated parameter model based on system response was developed in order to study the response of a the pressure trasnducer under the non-linear point of view. As to estimate the influence of some parameters involved in the measurement, different types of transducers were used (micromanometer, capacitive sensor and a condenser michophone) to promote the intercomparison between available techniques and the esxperimental pressure a data obtained. The transmission line concepts, based upon the electrical analogy, were also used to explain the source of systematic errors present in the measuring technique. Technical recommendations, based on a distributed parameters modelling, are provided leading to restrictions of the length of the tube which connects the transducer to the wall pressure taps. Measurements of mean velocity and intensity of turbulence were made by means of a hot-wire anemometer. In some of the conditions investigated, in comparison with the undisturbed turbulent flow, acoustic perturbations indeced and increase of velocity fluctuations of the order of 100 per cent, due to the coupling of the turbulence and the excitation acoustic wave.