The study of displacement machines, and in particular external gear pumps has improved the understanding of the important features of operation. Applying these underlying phenomena to new design methodologies has brought new advances in quieter machines by designing for the reduction of fluid-borne noise, cavitation, and pressure peaks. The present work seeks to expand on the previous modeling and experimental efforts by directly considering the effect that design changes to the pump and to the system are predicted to apply on the sound emitted from displacement machines and the attached lines. In particular, the current document focuses on efforts related to the noise propagation from the pump into the hydraulic lines, and out of the lines to the environment by comparing the model to experimentally measured values for the fluid and air-borne noise.