What is the best sample rate
and sample size to use?
There is no best size - selection is a compromise between
increased frequency resolution (more sample points or lower
sample rate), noise immunity (more sample points), and performance
(less of everything).
For woofer impedance testing (to get Q and resonance) use
the largest sample size and lowest sample rate possible.
Note that sample rates below 44KHz are not correctly filtered
by most sound cards and will cause aliasing (frequency response
For acoustic measurements and crossover design a lower
sample size is often adequate, but use a 44KHz sample rate
to have woofer and tweeter response with the same frequency
For passive component testing a lower sample size is often
We recommend using 8K to 16K sample size and 44KHz sample
rate for most tests. Lower sample sizes won't be significantly
quicker - but noticeably less accurate. Lower sample rates
will be more accurate but noise levels will increase dramatically
due to the filtering issue.