It's a 500 dollar, 3000 watt, 4 inch coil 18. Not a bargain but not really overpriced either. The only experience I have with them are tuned super low and listening to slowed music on them. They were as good as anything else I imagine. Nothing wow'd me about them. Couldn't reach very high but they were definitely clean down low. They were only on a 3500 so you could say they were underpowered but still sounded good. Not near their capabilities but any sub of that kind is going to be a good sub