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The Ultimate Acoustic Stethoscope Review (page 5)

Stethoscope Frequency Response (Human Heart Power Spectra):
    Human heart power spectra were recorded from the diaphragm using both stethoscope earpieces attached to the microphone of our sound pressure meter. The control was the microphone pressed directly against the chest wall. The sounds were analyzed for sound pressure level in decibels as a function of frequency from 20 Hz to 20,000 Hz. All spectra shown below were recorded on the same patient (volunteer 1). The results show that most stethoscopes amplify sounds below 100 Hz and attenuate sounds above 200 Hz.

Model Cardiac Frequency Response (Power Spectra)
ADC Platinum Cardiology 615 Frequency Response ADC Platinum 615
ADC Adscope Professional 603 Frequency Response ADC Adscope 603
AllHeart Cardiology Frequency Response Allheart Cardiology
DRG Puretone Traditional PT3 Frequency Response DRG Puretone PT3
Single Head Nursing Stethoscope Frequency Response Single Head Nursing
Littmann Cardiology I Frequency Response Littmann Cardiology I
Littmann Cardiology III Frequency Response Littman Cardiology III
Littmann Master Classic II Frequency Response Littman Master Classic II
Littmann Classic II SE Power Spectra Littman Classic II SE
Omron Sprague Rappaport Frequency Response Omron Sprague Rappaport
Prestige Sprague Rappaport Stealth Frequency Response Prestige Sprague Rappaport
Welch Allyn Tycos Elite Frequency Response Welch Allyn Harvey Tycos Elite

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