Ok, this is more a curiosity thing than anything.
So, the HP+ amp is a 2,400 watt amp at 4 ohms, which is what it runs at with a single HP+. However, if you connect a slave cabinet, then it is capable of producing 4000 watts at 2 ohms, essentially doubling the output and driving the slave sub at the same (or close to the same) level as the single sub.
My question is about the 4 ohms vs. 2 ohms. Does this happen because when the slave unit is hooked up that essentially the speakers are now wired in parallel, which drops the resistance to 2 ohms?
Is that essentially what's going on and how the resistance is dropped and the amplifier output is increased?