In this work, the effects of the jet’s initial conditions on the aeroacoustic properties are studied. The present investigation has been carried out using a Large Eddy Simulation (LES) database containing pressure time series covering a domain that varies in the stream-wise direction from x=0 up to x/D=20 and in the radial direction from r/D=0.5 (nozzle lip) up to r/D=3, where $D$ is the jet exit diameter. As mentioned above, the key parameter we explored is the boundary-layer thickness ($\delta_{BL}$), which has been varied keeping fixed the nozzle exhaust turbulence intensity at $TI=0\%$. Specifically, the value of $\delta_{BL}$, normalised by the nozzle radius $r_0$, spans from 0.025 up to 0.4. The acoustic component of the near pressure field of the jet is extracted by applying a wavelet-based procedure to the pressure data. The decomposed signals are then analysed separately in terms of statistical quantities.