It's called Flash AudioAds that will automatically play when you load the page. For example, I often find news on Google News and land on website like TechTimes dot com. It automatically play the annoying audio which I can't turn off. It's very annoying.
As you can see in the screenshot, you see a speaker icon in the tab. It's a Flash component.
In the latest FireFox browser, it automatically disables Flash plugin. However, Chrome browser by default has Flash Plugin enabled. To disable the Flash plugin and auto play audioAd, you simply type the following command in the Chrome Browser address bar.
chrome://chrome/settings/contentIt will popup the following screen.
Simply scroll down and find Plugin Section and click on "Manage Individual Plugin"
Find the Adobe Flash Player plugin and disable it. Restart your Chrome Browser.
I highly recommend anyone to disable Flash Plugin. It's really unsafe. With new HTML5 audio and video available on modern browser, Flash plugin will be obsoleted.