Both units record to SD or SDHC cards, while the DN-F650R will record to USB drives as well. They also share basic recording features such as mark placement, record level controls, 1/4-inch headphone outputs and controls.
The DN-F450R is a half-rack unit or desktop unit.
The rackmountable DN-F650R has XLR balanced connectors, pitch control (±12 percent), a USB keyboard input, USB output for computer use and tape-style transport controls.
Prices: DN-F450R $599; DN-F650R $799.