Sample Rates. There are a few rules you can use in selecting the correct bandwidth for a sample. First of all, the sample rate is 2.5 times the bandwidth. Thus, if you enter a bandwidth of 10,000Hz, you are sampling at 25,000 samples per second.
Use as high a bandwidth as you can. Bigger is almost always better. If a sound has absolutely no high end or if you need a lot of samples in memory at one time, then you can save space by sampling at a lower bandwidth. You will sacrifice high end and you definitely add some noise at lower sample rates. Personally, I rarely go below 10,000Hz bandwidth, unless it is a dullish sound to begin with, or will not be very loud in the mix.