I have 7 of these custom amplifiers with crossover devices. Many of them work, but not sure so selling for parts. Each chassis Includes a Hypex analog power supply, two Hypex UCD 400HG with Hxr amplifier modules and a Marchand UX44 crossover with a crossover board set for 3000hz with 12db slopes. Marchand can supply any crossover frequency and slope you prefer.The unit does power up.