an acoustic liner jet engine inlet barrel is formed from a perforated permeable skin , a honeycomb core , and a solid facesheet , each of which is formed in a one - piece configuration such that at most only a narrow single fore - to - aft splice , or no spice at all , is present in the finished product . the acoustic modal content remains unaffected , thus preserving a high degree of liner effectiveness , increasing the total active acoustic area of the barrel while decreasing its weight , and increasing its durability .