Sound and music can be delivered quickly and effectively over the Web. High-quality audio files can be compressed so that they maintain their fidelity, yet the data rates required to deliver the file remain reasonable. This is especially true when using streaming audio.
But quality is imperative in web audio. Any type of digital data compresses best when it begins at the highest quality possible. For example, a blurry photograph will remain blurry when digitized, and file compression such as JPEG will only emphasize the blur. This is also the case with sound files. An audio file that begins its digital life with background noise or with a low dynamic range will be difficult to repair, and its flaws will be more apparent after the extensive downsampling and compression required to make the file web-deliverable.
It is difficult to remove noise once it is present in a signal, so always try to record in the quietest place possible and take steps to reduce or eliminate environmental noise (e.g., turn off unneeded equipment, turn off or lower the ventilation system). However, if your recorded audio does have noise, you can reduce or sometimes eliminate it using the equalizer and noise gate features of sound editing software such as SoundEdit 16. One trick when using the equalizer to reduce noise is to raise each band individually until you find the one that contains the greatest amount of noise. If you can pinpoint the band that adds the most noise, you can lower that band and reduce the noise.
Example with noise