This is especially true when using the soft-sealing eartips. If the soft-sealing eartip is too large for the user, the compression of that eartip while in the ear, could result in poor acoustical performance. This could also be true if the eartip is too small. Finding the correct size of the individuals ears result in the best acoustical performance. Back to the top Difference in Acoustics Among Littmann Models First of all, one has to realize that there are many factors that contribute to acoustic response, such as having a complete seal from the point of auscultation to the stethoscope user's ear canal.
Outside factors can also contribute.
We can cite our laboratory test results, but these do not include factors like ambient noise, motion artifact, and ear canal seal. Because of variables in each individual's hearing, we recommend trying the stethoscopes before purchasing. The price of the Littmann stethoscope product line correlates to the laboratory test results in acoustic response. The Master Cardiology has the best acoustic response. Back to the top Tunable Diaphragm Old stethoscopes cannot be retrofitted to accomodate a tunable diaphragm.