These are a custom pair of powered monitors. They were built as a technology demonstrator for another product. They sound great and are on par with comparable products costing many times what I'm asking for these. The crossovers are steep slope and phase corrected. The drivers are FAR better than anything you will EVER find at this price. They can be easily setup for use as a three way system with an active subwoofer or pair of subs . The amplifiers are Hypex UcD technology. There are over $1300 in parts alone. Please keep in mind you are getting speakers & amplifiers for this price!