Sony MXD-D40

Name: Sony MXD-D40
Brand: Sony

A one-disc CD player and a MiniDisc recorder in one box, with 4× dubbing and a 20-bit converter.

Overview

The MXD-D40 is a single-disc CD player and a MiniDisc recorder sharing one chassis, and the reason it exists is the button on the front that says "dub." Sony's own literature for the model makes the pitch plainly: the deck coordinates its playback and record sections so that copying a CD to an MD is a one-touch operation, and it does the copy at high speed — four times normal, according to Sony's 2001 product documentation. That speed is the whole point. Anyone who sat through a real-time dub of a full CD onto MD knows the difference between a machine that copies in seventy-odd minutes and one that does it in under twenty.

The deck measures 17 inches wide, 4-1/4 inches tall, and 12-7/8 inches deep (430 × 110 × 325 mm) and weighs 11 lbs. (5 kg). That is standard component width and standard component weight, with nothing exotic in the casework. The engineering budget went into the conversion chain, not the sheet metal.

The record path starts at a 20-bit analog-to-digital converter, paired with a Hybrid Pulse digital-to-analog converter on playback. The 20-bit A/D is a step down from the 24-bit converters Sony fitted to its step-up decks in the same line. The MXD-D5C, MDS-JB940, and MDS-JE470 all carry 24-bit A/D, and that shows where the MXD-D40 sat in the lineup. It's not a crippling difference for MD recording, which compresses anyway. The transformer is an EI-core type, not the R-core found in the JB940 and PC3. Sony's own copy calls R-core "an expensive, refined approach" that reduces radiated hum, so the D40's power supply is the workmanlike option. Gold-plated inputs and outputs are present on the D40. The JB940 and JE470 have them too, but the D5C and PC3 do not.

The MiniDisc section runs Sony's Wide Bit Stream technology with ATRAC version 4.5, and it supports MD Long Play in both 2× and 4× modes, stretching capacity to four times normal. There's an 8× digital filter and a sampling rate converter that accepts 32 and 48 kHz digital inputs alongside the native 44.1 kHz, so DAT-sourced material can be recorded digitally without an outboard converter. Frequency response is quoted at 0.5 dB tolerance: 2-22,000 Hz in standard play, 2-14,500 Hz in long play. Signal-to-noise ratio and dynamic range are both listed as greater than 90 dB. Wow and flutter are listed as unmeasurable, which makes sense since there's no transport to flutter in playback. The mechanism uses three direct-drive motors and two record/play heads, and search runs at 200× and 400× alongside normal speed.

The connections are sensible rather than lavish. Line in is 500 mV into 47k ohms. Line out is 2 volts rms into a 10k-ohm load. There are both optical and coaxial digital inputs, an optical digital output, and a headphone jack rated 1.2 mW into 32 ohms with variable level. The headphone volume control on the front panel is a small thing that a lot of decks in this class skimped on.

Scale Factor Edit lets the owner adjust the volume of individual tracks after recording without disturbing the music, which helps when compiling from sources recorded at different levels. Playback pitch control tunes MD playback sharper or flatter. Sony's copy pitches this at instrumentalists who want to play along, and it's an unusual feature to find on a consumer deck. Smart Space inserts a uniform three-second gap between tracks. Repeat modes cover single track or whole disc. The two-line fluorescent display shows title information for both the CD and the MD, and CD TEXT and Custom File data transfer between the two sides. A Remote Commander with direct track access, title input, and power control is included.

Two omissions stand out against the sibling machines. The MXD-D40 does not have PC keyboard input, though the D5C, JB940, and PC3 do. Disc and track titles have to be entered the slow way from the remote unless the owner adds Sony's optional PCLK-MN10 PC Link Kit. That kit, a USB interface with software for Windows 98, Me, and 2000, connects to the D40 through a dedicated miniplug and the Control A1 interface. It enables ripping CDs on a PC, dragging and dropping tracks to MD, and typing titles. The D40 has the PC Link terminal built in, but the kit itself was not supplied. The deck also lacks the insulator feet, aluminum front panel, slanted circuit board, S-TACT circuitry, and 24-bit variable-coefficient digital filter that distinguish the JB940.

The overwrite function solves a real MD annoyance. It lets the owner record over an existing track without erasing the entire disc.

Pro-Audio-Review (February 2003, p.78) listed the MXD-D40 among recorders and players in its coverage of the format, part of the small body of contemporary print attention these decks received — MiniDisc hardware was reviewed far less thoroughly than CD gear of the same era, and the D40's press footprint is thin. That scarcity of documentation is worth knowing before buying: service information exists, but the deck never generated the magazine coverage that would make troubleshooting a matter of looking up a familiar review.

The MXD-D40 was not the deck anyone chased in 2001. That was the JB940, with its R-core transformer and 24-bit conversion. The D40 does what most people actually needed: get a CD onto an MD quickly, with decent conversion, and play both back from one box. The 4× dubbing and the one-touch synchro record are the reasons to own it. The 20-bit A/D and EI-core transformer are the reasons not to pay ES money for one. Prices reflect that, and these trade as working tools rather than collectibles. The buyers are largely people with a shelf of MiniDiscs and a deck that finally died. The usual cautions apply to any MD machine of this age. The format's mechanical tolerances are unforgiving, and the decks are old enough that service is a specialist's job.