speech feedback will only show up if you either have "speakable items" turned on or are using an application (such as Chess) that uses speech recognition. in the former case you can turn off speakable items in speech system preferences. in the latter I'm not sure. In Chess you can turn off speech options in chess preferences. if you then restart chess Speech recognition won't show up. Other programs might have similar options.
As I discovered, I did, in fact, have a "speakable item" app. turned on. When i quit it, the Speech Feedback icon in the dock popped out and disappeared.
Good Call!
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Can't Remove Speech Feedback From Dock
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