This is a Victor VOSS PS-A1504D Class D power amplifier. It's a 4CH/2ch power amplifier in good working condition, producing excellent sound. The input terminals are originally Euroblock terminals, but this unit has been modified with XLR terminals, allowing for connection with standard balanced cables. Rated output: 4 channels: 150W x 4 at 4 ohms, 100W x 4 at 8 ohms, 2 channels: 300W x 2 at 8 ohms. This amplifier is also a fanless model, making it very easy to handle even during operation. Thank you.