MARANTZ CDR300 (Superscope) Recording Equipment. The CDR300 by Marantz Professional is the world's first CD Recording system designed for stand-alone portable recording. This professional CD recorder offers the functionality of a professional tape recorder while recording directly to blank CD-R/RW media. Once finalized, recorded discs will playback in virtually any CD player. To record, simply place the compact and lightweight CDR300 on a table-top, plug it into an AC electrical outlet, and record live using either the internal microphone or external microphones that attach to stereo XLR or 1/4-inch mic/line inputs. Because a preamplifier is built into the unit, an external mixer or mic preamp is not required. A built-in speaker or headphone jack conveniently allows recordings to be monitored. High and low EQ and high and bandpass filtering can be independently adjusted for each mic/line input in the preset menu. 48-volt phantom power is available for condenser microphones. The unit also provides manual or automatic level control, limiter, and digital level meters.