![]() The 2 images below provide a comparison of the length of sustain of the 2 types of unweighted tuning forks using a spectrogram analysis - see the lowest thin white line. The felt vibration of the Biosonic tuning fork lasted 18 seconds, while the Indian tuning fork lasted 14 seconds. We tested how long the vibration of each mid-Ohm tuning fork could be felt after activation.Įach fork was activated and placed on Jane's sternum and timed to discover at what point the vibration died away. Unweighted C fork:- Biosoncis 42 seconds and Indian: 32 seconds Felt Vibration: Mid Om forks:- Biosonics: 48 seconds and Indian: 39 seconds We tested how long each fork could be heard after activation. The Indian tuning fork displays more harmonics - 9 harmonics with the Indian tuning fork compared to 7 harmonics with the Biosonic tuning fork.ģ of the higher harmonics of the Biosonics tuning fork are shown to be more audible with a greater amplitude and to have a longer sustain than the Indian tuning fork. 256 Hz UNWEIGHTED AMERICAN (BIOSONICS) TUNING FORK The harmonics are shown by the thin white lines in each image. The 2 images below provide a comparison of the harmonics of the 2 types of tuning forks. The tuning forks were tapped using the same mallet at similar velocities and held in a similar position close to the microphone of an iPhone 12 Pro, one minute apart, thereby maintaining similar environmental conditions. SPECTOGRAM COMPARISON: 256 Hz UNWEIGHTED TUNING FORKS Conclusion:įor this type of tuning fork the spectogram comparison shows that there is little difference between the two brands of tuning forks. 136.1 Hz MID-OM WEIGHTED AMERICAN (BIOSONICS) TUNING FORKġ36.1 Hz MID-OM WEIGHTED INDIAN TUNING FORKīoth brands of tuning forks display the same 10 frequencies and the sustain pattern for each harmonic is similar. The forks were tapped using the same mallet at similar velocities and held in a similar position close to the microphone of an iPhone 12 Pro, one minute apart, thereby maintaining similar environmental conditions. SPECTOGRAM COMPARISON: MID-OM WEIGHTED TUNING FORKS Unweighted C tuning forks (256Hz) - Biosonics tested as 256 Hz (spot on) and Indian fork to 256.5 Hz so the accuracy was 0.18%. Mid Om forks - both makes tested as exactly 136 Hz which is accurate to 0.07% We have found that both makes of fork normally fall within the accuracy range of +/-0.25% Testing Results The Indian tuning forks are guaranteed to an accuracy of +/-0.25% This allows for temperature changes and testing variations. We have carried out our own tests to compare 2 types of tuning forks from the different manufacturers:īiosonics tuning forks are guaranteed to an accuracy of +/-0.5. Sound Therapy Shop sells top quality aluminium tuning forks manufactured in America and India. ![]()
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