High current means it has a good power supply and sufficient output devices to provide it. It doesn’t really mean much unless they tell you the load impedance.
I remember a review a long time ago where a 45W Pioneer receiver put out the same 12.5A as a 50W Mark Levinson separate amp that was touted for it’s current output ;)
https://www.worldradiohistory.com/Archive-All-Audio/Archive-HiFI-Stereo/80s/HiFi-Stereo-Review-1987-01.pdf
Most of the stuff that guy goes through you only have to do once. You don’t need an SPL meter so that part is optional, you just need enough signal to make a measurement. I would look at the manual for calibration and measurement procedures.
Because REW can work with any mic, sound card, computer, amp etc, there are more settings to play with. IT is also much more powerful than some AVR calibration and can give you information you can use anywhere. The AVR already knows the mic sensitivity and gain settings to use so none of those settings are really necessary.
Doing speaker measurements should be gated (maybe 5ms) to remove reflections rather than long ones like this guy does. Room measurements are long like he shows.
Overrated: Maggies, Klipschorns.
Underrated - there is no such thing.
One of the most laughable products in the industry. The complex rationalizations that have developed to defend them are hilarious. If you don’t want to put your $X000 cables on the floor, that’s ‘audiophilia nervosa’.
NAD uses small power supplies, that is their “virtue”. Show me an amp with high dynamic range and I’ll show you an amp with an undersized power supply.