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So, you're new dimmer switch is installed and creating perfect lighting is a breeze. The problem is, however, that you keep hearing an annoying buzz. No worries, this is a problem that is typically easy to fix. The first thing that you should do is to upgrade the bulbs in your fixtures. Splurge and buy the higher quality bulbs (and get them from a different manufacturer).
Most of the time this will eliminate the buzzing. If the posts inside the bulb are cheap, they buzz due to vibrations, but if they are stronger, like those used in most high quality light bulbs, no vibrating sounds will be emitted. If, changing the bulb doesn't work, consider upgrading your dimmer switch.