What do you think of this power cord?

cleeds,

That is why the factor of 2.5 was mentioned.... to account for differences in the class of the amplifier and more as described below:

The back panel measurement is done with a 1khz STEADY sine wave signal. The REALITY is that with music, especially if you happen to be listening with max power on, the dynamic passages may require a lot more power.

In addition, the speaker load impedance is not constant. With different frequencies, it may sometimes drop down to as low as 1 or 2 ohms, in which case a LOT more power is drawn than mentioned on the back panel.

The safety factor of 2.5 takes into account all those situations.  I just did not want to go into all the detail but it seems like some people need the explanations.

cakyol

That is why the factor of 2.5 was mentioned.... to account for differences in the class of the amplifier ...

Huh?

The back panel measurement is done with a 1khz STEADY sine wave signal ...

Nonsense. The current rating of any appliance is the current rating. I don’t care if you’re talking about a refrigerator, furnace, or audio amplifier. An audio amplifier is typically spec’d to include current draw at idle and maximum power.

You cannot accurately determine an amplifier’s current requirement by using calculations involving solely its audio output in watts and your rules-of-thumb. And why bother? The info you need is almost always on the back panel, the user manual and the spec sheet.

cleeds,

Please read a bit more about amps, dynamic & transient loads

cakyol

Please read a bit more about amps, dynamic & transient loads

Please feel free to share any documentation to support your claim that appliances have current requirements in excess of that defined by the manufacturer. That appliances have "dynamic and transient loads" is a given and doesn’t support your claim.

Please feel free to share any measurements you have made that also confirm your claim; if you choose do do that, please identify the appliance so that we can attempt to duplicate your measurements. These are very easy measurements to make.

Are you familiar with the NEC? IEEE? OSHA?

It amazes me how quickly and loudly some will argue about things that are easily measured. There’s no reason to dispute this stuff. <SMH>

As I said previously, please read some more books about amps, especially when the speaker load drops to 1 or 2 ohms of impedance at certain frequencies.

Here is some very basic education to start with:
https://geoffthegreygeek.com/speaker-impedance-changes-amplifier-power/

All this is for over-engineering and increasing the safety margins so you can sleep better at nite :)