When I was looking at details of this subwoofer and checking reviews I was a bit concerned if it is enough powerful to give me some nice kick. Well, I've installed it in my city bug and it is absolutely too much for me. Probably because car is small, but it's shaking all the mirrors, glass and my chest vibrates even if it's not turned all the way up. I keep it at ~20% as you can't stand more for long time. And sound is clear, deep and dynamic. I've done test with different frequencies on it and it starts giving fun at 30Hz so I confirm it goes very low. I'm very pleased with this purchase. Don't know about bigger vehicles but for something like Aygo is more than you ever going to need. The only con is bass boost control knob is a bit hard to tune as it goes from nothing to quite loud with very little movement. So you need to be gentle and tune it with fine spin. Quite hard when you're driving.