How to read signal db level

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http://androidforums.com – Ok so i decided to switch my triumph running cm9 to signal db or noise instead of bars.. right now its at -91 whats considered bad and good levels (i know stick with the bars they are easier to read blah blah :p) i hear that signal db is alot more accurate so could someone give me a positive to negative scale based on the numbers that are used? thanks (General)