Periodic sound reduction at some frequencies and high pressure loss could be considered as the disadvantages of simple expansion silencers. Generally. reactive elements are applied in silencers to optimize their acoustic and aerodynamic performance. In this paper. https://www.diegojavierfares.com/deal-alert-Has-the-Tribulation-Begun-Study-Guide-Avoiding-Confusion-and-Redeeming-the-Time-in-These-Last-Days-must-buy/