Here’s a look at the two back-to-back. The old amp on the bottom was rated at 25 Watts x 4 for the full range channels and 75 Watts x 1 for the subwoofer channel. The smaller, lighter Kicker on top is rated at 100 Watts x 4 for the full range and 400 Watts x 1 for the subwoofer. Now I see how it got those numbers. Even if you didn’t turn it back down, the system will last almost twice as long on one battery. And, if you didn’t need to be blaring the music the whole time, it would go even longer when you turned it to normal levels. Who says good things don’t come in small packages?