I haven't read all the comments, but I have the impression that it's not about the quality of the amplifiers, but about the DC power supply. If we take an amplifier that can output 300W, it requires 50V DC from the power supply. Old-style power supplies need a 35.5V transformer that charges the capacitors to a peak voltage of 50V. This is exactly +3dB more Voltage. So we have 3dB Energy in Capacitors. If the capacitors are too small, they will be discharged and the voltage will drop to 35V, which will cause clipping and destruction of the tweeters. The situation is better if we have modern switching power supplies that hold the voltage until they reach the limit of their capabilities.