This article presents an exhaustive analysis of flanking transmission across a junction composed of double walls. The analysis is mainly based on measurements carried out on a half scaled test bench where all element dimensions have been reduced by a factor 2 compared to the specifications of the standard ISO 10848. To show the same physical phenomena, the ratio between the wavelength and the wall dimensions have to be maintained. This means that the frequency range of interest has been increased by a factor 2. The test bench offers many advantages like an easy handling of elements and a significant reduction in construction costs. The measurement results are also used for the calibration of a FEM model, an SEA model and a wave based model.