an ejector and method of reducing jet engine noise are disclosed wherein the primary combustion gas stream of the jet engine is ejected into a mixing section or zone of the ejector and into which a secondary gas stream is also injected at a velocity sufficient to create a choked or mach 1 . 0 mixed flow condition , resulting in rapid mixing of the primary and secondary gas streams in the mixing zone . a diffuser is connected to the ejector downstream from the mixing zone for pulling the mixed gas stream through the mixing zone . the diffuser has an exit area greater than the area of the mixing zone . the ejector is provided with means for adjusting the area of the mixing section or zone and diffusion section to match engine operating conditions so as to create proper conditions within the mixing zone for noise suppression . noise suppression by the method and means disclosed occurs at all frequencies with a minimal loss of thrust , and possibly a slight gain .