Which amp is this?here's an example of a amp being tested at 1 ohms
Ratings :
2500 @ 1 ohm
1200 @ 2 ohms
600 @ 4 ohms
----------
Testing :
Wired @ 1 ohm
1690 Watts
21.4 Amps
78.97 Volts
3.69 ohms Actual
here we know the actual ohm rise, not just guessing