The IA40.1 is a monster to say the least. This amplifier has the capability of destroying the most powerful subwoofers in the world. The IA40.1 comes with a badge that we like to call "Elite". In other words, this amplifier is in a class of its own. It has all the same features as the other amps in the IA line, but produces tremendous amounts of power at a wide range of voltages and impedances. The IA40.1 features dual 1/0 battery inputs in order to supply the guts of this beast. It is rumored that this amplifier is "under-rated", but who knows?