Bob, let's say you've got a SS amp which draws 225W at idle but draws 1200W at rated output (200W/400W into 8/4 ohms). So at let's say a nominal (audio) output of 100W/200W into 8/4 ohms, it's drawing around 600W from the wall. W/V=A, or 600/120=5amps.
Typical amplifier nominal output voltage is around 50V for a 20dB voltage gain (over the preamplifier output) and which is a pretty loud listening level if the speakers are reasonably efficient. Again using W/V=A, you get 2A (@100W) for an 8ohm speaker and 4A (@200W) for a 4 ohm speaker, unless I'm way off somewhere.
An example would be my Levinson amp which will provide 400W/ch into my 4 ohm (nominal) electrostats, but at the loudest listening levels I can stand, it's only drawing 400W from the wall (or 3.3A) and it's only putting out around 150W rms of audio power, which at its 67V (26dB) gain, is only around 2.2A to the speakers (vs. 3.3A from the wall.)
The example you gave assumes an 8V output voltage which would be only about a 3dB voltage gain for the amp. Not very loud, even with a super-efficient speaker.