I can tell you guys that Z2LV puts out @ 1 Ohm 1% THD: 4000wrms on 10volt, 5000wrms on 11volts, 5800wrms on 12volt, 8350wrms on 14,4volt. And the efficiency is 81%
The Z2HV puts out @ 1 Ohm 1% THD: 5000wrms on 12volt, 7700wrms on 14,4volt and the efficiency is 79%.
So in a 12V system the Z2LV gives you 800wrms more power