Abstract: A textile interlacing jet is used to muffle noise in the frequency range of 3 kHz to 20 kHz by providing abrupt cross-sectional area changes. The jet includes a main body with a yarn inlet and a yarn outlet at opposite ends. A first reactive muffler is disposed in association with the yarn inlet and includes an expansion chamber and a restricted inlet to the expansion chamber, the ratio of the cross-sectional area of the expansion chamber to that of the restricted inlet being at least about 9:1, and preferably at least about 25:1. A second reactive muffler is disposed in association with the yarn outlet, and has similar abrupt cross-sectional area changes. A plurality of expansion chambers and restricted outlets may be provided in the second reactive muffler.