Abstract. The acoustic effect of cryogenically treating trumpets is inves-tigated. Ten Vincent Bach Stradivarious B? trumpets are studied, half ofwhich have been cryogenically treated. The trumpets were played by 6 play-ers of varying proficiency, with sound samples being recorded direct to discat a sampling rate of 44.1 kHz. Both the steady-state and initial transientportions of the audio samples are analyzed. In some cases, a slight shift ofpower in the harmonic spectrum toward the higher frequencies is observed inthe treated trumpets. However, no statistically independent results are seen,and the most pronounced results were not repeatable. Differences observedin player-to-player and trumpet-to-trumpet comparisons overshadow any dif-ferences that may have been brought on due to the cryogenic treatment. Alldata was collected in a double blind fashion. The treatment itself is a threestep process, involving an 8 hour linear cool down period, a 10 hour period ofsustained exposure to -195 ?C (-300 ?F), and a 20-25 hour period of warmingback to room temperature.