MB Quart XA1-1000.1D 1000W Monoblock X-Line Series Class D Amplifier XA1-1000.1D - MB Quart Monoblock 1000W RMS Class D X-Line Series Amplifier Peak Power Rating: 4 ohms: 250 watts x 1 chan. | 2 ohms: 500 watts x 1 chan. | 1 ohm: 1000 watts x 1 chan. Fluid-FETS hand selected insulated MOSFETS Focused mass heat sink designs Dimensions: 9.20"W x 12.50"L x 2.20"H