The Onkyo MD-2521 is a MiniDisc recorder that combines advanced recording technology with user-friendly features. Manufactured between 1999 and 2002, the device comes in black and a silver/aluminum finish. It has a compact design measuring 435 mm in width, 121 mm in height, and 310 mm in depth, with a weight of 4.5 kg. The power consumption is rated at 14 Watts. The MD-2521 offers a range of connectivity options including two optical inputs, a digital coaxial input, and an analogue input via stereo Cinch. Its outputs consist of four optical digital outputs, analogue stereo output, a 3.5 mm socket for the Onkyo RI system bus, and an adjustable headphone output. The device supports a signal-to-noise ratio greater than 105 dB and a frequency response from 10 Hz to 20,000 Hz, with data compression handled by the ATRAC format and a standard sampling frequency of 44.1 kHz. It boasts playback options including Play, Repeat, Program, and Shuffle, as well as the ability to edit recorded MiniDiscs. The unit features a timer/standby function and supports longplay mono recording. The display is comprised of two lines, with varying color schemes based on the model. Its sturdy construction incorporates a metal frame and a brushed aluminum front, adding to its durability and aesthetic appeal. The device also includes synchro recording capabilities when paired with Onkyo CD players and other compatible devices, and it comes with remote control, the Onkyo RC-339MD. Other models in the series include the Onkyo MD-2321, while the MD-2511 serves as its predecessor. The MD-2521 does not have a direct successor.
