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don't think 1000W amplifier is some thing easy to build even if you was meaning audio amplifier
because the schematic diagram is not enough to build it needs some math calculation concern with concept of impedance matching you need
A 1000W audio amplifier will explode almost all speakers. Its power supply and output voltages can kill you. It will be very expensive.
Here is a good 1500W amplifier project: https://sound-au.com/project117.htm