Wenn ich jetzt ein 500 Watt LED Netzteil hab und eine 1000 Watt Endstufe funktioniert es dann?

If the power supply outputs a reasonably constant DC voltage without HF-Rotz, matching the amplifier, and it becomes clear with fluctuating load, this works.

However, if “LED power supply” is on it or it is declared by the manufacturer as such, this is intended for illumination and may not meet these criteria.

However, you can not fully run the final stage if it outputs real 1000W RMS, as the power supply otherwise overloads.

The state must be prevented (overload protection integrated in the power supply unit or its own fuse).

A suitable power supply has a proper reserve to the top, because:

1000W RMS output at full speed means: 1000W average power consumption + loss.

The current output of a switching power supply is the maximum value.

This means that music with a lot of dynamics would be far ahead of 500W.

As you might have noticed, the costly and valuable of such an amplifier is the power supply, not the power electronics.

Due to the principle, switched-mode power supplies emit more EMC interferences (electrosmog), which can be applied to the amplifier input and are also reinforced. Then bruise, get out and whistle it out of the speaker.

For Hifi, a strong conventional transformer made of iron core and two solid windings is therefore still the better choice. He’d be quite a bitch in your case.

So let it be to want to run a final stage at home and buy a Hifi or PA amplifier for your purpose.