Sampling Rate and Frequency Resolution  Higher sampling rates
are not automatically better, because a higher sampling rate
means lower frequency resolution for the same FFT size. To
understand what that means, open the Analyzer Settings dialog
and experiment with changing the sampling rate from 11025Hz to
96000Hz. Notice how the frequency resolution decreases as the
sampling rate increases.  If the sampling rate is doubled, the
FFT Size also needs to be doubled to get the same frequency
resolution. Therefore, set the sampling rate as high as
necessary for the highest frequency that you want to measure,
but not higher. If you want to measure very low frequencies
(100Hz or lower), lowering the sampling rate will increase the
accuracy of the measurement without requiring a larger FFT Size.
The table below shows the spectrum of a tuning fork that is
tuned to 105Hz at various FFT Sizes to compare the analyzer
accuracy at sampling rates of 11025Hz and of 44100Hz. You can
download the recordings here and load them