Crown CDi 1000 Two-channel, 500W @ 4, 70V/140V Power Amplifier Extremely versatile; rated for 2-, 4-, 8-ohm loads and 70V and 140V outputs Switch-mode universal power supply Intuitive front-panel LCD screen for quick, easy configuration Onboard digital signal processing includes crossovers, EQ filters, delay, and output limiting Up to 20 user defined DSP presets are available