For 1000W RMS, manufacturers like MTX Audio recommend using 1/0 AWG or at least 4 AWG power cables to handle the current flow safely.
A massive power supply is required, often utilizing a heavy-duty transformer (e.g., 1KVA) and a dual DC supply (e.g., ±70Vplus or minus 70 cap V ±90Vplus or minus 90 cap V ) to provide sufficient "headroom". 1000 Watts Power Amplifier Diagram
(PNP), which are popular in 1000W designs due to their high power handling. For 1000W RMS, manufacturers like MTX Audio recommend
Because these circuits generate significant heat, large aluminum heatsinks and cooling fans are mandatory to prevent component failure. 1000 Watt Powerful Amplifier Circuit - Facebook For 1000W RMS