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This article describes how to assess power requirements and choose the correct amplifier size for your application.
FlatPanel Demo systems come with the amplifier preconfigured, and should work well out of the box. However you may need to adjust the level of the subwoofer - and this article covers that topic.
Are you using QSys, Crestron, Symmetric, Xilica, or other DSP/Control solutions in front of your FlatPanel / LEA Amplifier combination? If so, please read this short note.
Are you concerned about the power draw of any of these LEA Professional amplifiers: CS1504 / CS1504D / CS3004 / CS3004D? Are you concerned about changing the mains power connector to a 15 or 20 amp Edison plug (USA) on any of these amplifiers?