Is a high priced Line Conditioner needed


I have 2 dedicated power lines coming in to my wall for my stereo.Do I need a high priced Line Conditioner to make my system sound better and or safe or will a small priced Monster do the trick?Why waste money on a High priced Conditioner for a dedicated line?Thanks for your help!
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The Furman Elite 15DMi doesn't change the voltage. It linearly filters and monitors voltage.It will shut the outlets down if voltage exceeds 140V or 85V.