How to tell the current from the amp

Most amplifiers are voltage devices that provide voltage gain and voltage based feedback.

The idea that they shove current out in a massive burst is not going to happen unless the speaker’s impedance is headed towards zero.

You may want to provide the impedance curve for your speakers?

I get the case where you have double the wattage with half the impedance, but such case only show the device is qualified as high current, but now by how high as a quantifiable measurement. It’s only a relative measurement. So there is no one measurement available to indicate the “current” capability? I don’t have electrical technical back, and I feel this concept is being mystified…

Measure the voltage.
The equation V=IR can be refactored to be I = V/R.

Once you have V and the impedance plot, then you know R at any, and all, frequencies.

If it is a constant 8 ohms, then I=V/8.
If it is 2 ohms, the I=V/2
If it varies with frequency, then it gets harder.

There is not a lot more to it than ^that^.

If the amp it trying to hit 50V, but only have rails at 28V, then you run out of voltage.
If the impedance that you are trying to drive is low, and the power supply has little capacitance and undersized in the transformer, then you cannot maintain the “umph” for very long.

If you are concerned with current, then you likely have a speaker than is very low impedance, or maybe have been told that you should be looking for current specs as a way to determine which amp to use.

Thank you all for the comprehensive science lesson. Really learned a lot here. I guess my point is the "lineality" (not sure if the right word) of co-relation between volts and impedance can be measured, and should be clearly marketed when a consumer is looking for a "current capable" amplifier, rather than using indirect formula to figure it out by themselves. 100/8 and 200/4 is just an indirect measurement, and i am sure there are ones perform 100/8 and 180/4, or more, or less. Why not just use one measurement to tell clearly, instead of leaving the consumer scratching the head and guestimate the math himself.

The education system’s lack of science is also reflected in a lack of critical thinking skills, that make the populous more prone to conspiracy theories.

Then add in marketing and prose, and it is like a shark feeding frenzy for a salesman.

I’ve mentioned the speaker’s impedance curve a few times.
If you were serious about making it easy, then I would have suspected you to have posted that? Or at least the name of the speakers in question.

You mentioned:

And if “current” is so important, why this is not a more easily marketable measure on the box of the product?

Are any speaker’s marketed as requiring specific amounts of current?

The reason why current is not easily marked on the specs, is that it is not really important except in some odd corner cases.

Current is not important.
- If the amp makes its voltage, then it also makes the needed current.