I just bought one of these for a 15" sealed box sub I am building to go with my Vandersteens (to complete my bass swarm with the two Velodyne subs I have already)
https://www.parts-express.com/crown-xls-1002-drivecore-2-power-amplifier-2-x-350w-at-4-ohms--245-507...
1,100 watts x 1 (4 ohms)
https://www.parts-express.com/crown-xls-1002-drivecore-2-power-amplifier-2-x-350w-at-4-ohms--245-507...
1,100 watts x 1 (4 ohms)