Sony MDX-66XLP (2002)
Six MiniDiscs in the dash, no magazine to fumble, and a compartment light that knows to shut itself off.
Overview
The MDX-66XLP is Sony's mobile MiniDisc changer — a six-disc car unit that Sony's own manual simply calls a "MiniDisc Changer," and that the collector community usually files under the MDLP car changer label. It arrived in March 2002, the manual copyright line reading "Sony Corporation 2002 Printed in Japan," and it carried the Xplod branding on the box. For anyone who was running MD in the car at the turn of the millennium, this was the top of the food chain: six discs, MDLP long-play, and a loading scheme that skipped the cartridge magazine entirely.
The headline claim is the playback time. As a 6-disc MDLP changer, it provides up to 32 hours of MDLP audio playback — that's the number that sold the thing. Stack six LP4 discs in the tray and you had a weekend road trip covered without touching a disc. The 10-second Shock Resistant Memory handled the bumps, and the deck could change five of the six discs while the sixth kept playing, with disc changes occurring seamlessly — no audible gap, or only a small one, in the output. That last detail matters more than the spec sheet lets on: a changer that mutes every time it swaps platters is a changer you stop using.
Sony built this one around a 1-bit D/A converter, which the manual pitches for "high quality sound reproduction," and Wide Bit Stream processing. A 1-bit DAC in 2002 was standard-issue Sony engineering, not a marketing flourish, and it's the reason these decks still sound clean today when the mechanism behaves.
The US model is analog-only — RCA jacks, no digital out, despite what Sony's own product page claimed at the time. That discrepancy is documented by owner Haemish Edgerton, who noted plainly that the US version "does not include a digital output." The MDX-66XLPRF variant is a different animal: it adds an optical digital output and is built as a standalone unit that couples to a vehicle's existing FM receiver via the antenna lead, complete with a small remote-mountable backlit display and a wireless remote. If you're shopping, know which one you're looking at before you commit.
Key Features
Direct Loading — No Magazine
This is the feature that separates the MDX-66XLP from the pack of magazine-fed changers. Sony's documentation is blunt about it: "Direct loading -- no magazine." You slide the door open until it clicks, the built-in compartment light comes on, and you feed discs in one at a time. No cartridge to load, no cartridge to lose, no cartridge to crack. For a car installation where the changer lives in the glovebox or console, that's a real ergonomic win — you can swap a disc at a red light without wrestling a plastic caddy.
The clear acrylic door lets you see the discs and their titles without opening anything, which sounds trivial until you've owned a changer with an opaque lid. And the compartment light isn't just a convenience: if the ignition key is in the OFF position, the light automatically goes out after one minute, so it won't quietly drain the battery overnight.
Six-Disc MDLP Playback — Up to 32 Hours
Six discs, MDLP support, up to 32 hours of playback. That's the core proposition, and it's a genuinely useful one for a car deck. MDLP discs recorded in LP2 or LP4 mode stretch each MiniDisc's capacity dramatically, and the changer's ability to hold six of them means the format's modest per-disc runtime stops being a limitation. The unit supports MDLP playback per the wiki documentation, and it's compatible with the Sony BUS system for mobile MD changers — it talks to the head unit over Unilink, so track and title data flows to the display.
Seamless Disc Change and 10-Second Shock Memory
Two specs that work together. The changer swaps discs while the current one is playing — five can be changed while the sixth plays — and the disc change occurs seamlessly, with no delay or only a small delay in audio output. The 10-second Shock Resistant Memory buffers playback against road vibration and potholes. Neither number is spectacular on its own; together they mean the deck behaves like a continuous music source rather than a machine that interrupts you every 74 minutes.
1-Bit D/A Conversion and Wide Bit Stream
Sony's manual credits the 1-bit D/A converter with "high quality sound reproduction," and the unit also carries Wide Bit Stream processing. In practice this is the difference between a car changer that sounds like a car changer and one that sounds like a decent home deck bolted under the seat. The analog RCA outputs are line-level, so the deck feeds whatever head unit you've got — no digital handshake required on the US model.
Mounting Flexibility — Up to 90° Off Horizontal
The MDX-66XLP can be mounted up to 90° off horizontal. That's a specification worth reading twice if you've ever tried to fit a changer into a cramped console or a glovebox with an awkward floor angle. Ninety degrees covers vertical mounting, which opens up installation spots most changers can't use. Combined with the compact footprint — roughly 7-1/4" wide, 3-5/16" high, 5-7/8" deep by the available estimate — it's a deck that fits where you need it rather than where it's convenient.
Unilink Control and the SIRCS Pin
The unit couples to Sony head units with Unilink control, and per the wiki documentation it has a SIRCS pin that may be compatible with M-Crew software. It's also similar to Sony's prior 6-MD changers, which means it could be used with Sony's RM-X69RF RF-based controller — handy if you're building a period-correct system around a head unit that doesn't have a direct bus connection.
The MDX-66XLPRF Variant
Worth its own subsection because it's a fundamentally different installation. The 66XLPRF is a standalone unit that couples to the vehicle's existing FM receiver via the antenna lead — no Unilink head unit required. It includes a small, remote-mountable backlit display and a wireless remote, and per the wiki documentation it ships with an FM converter and wired remote. Its FM broadcast frequency is settable to one of 88.3, 88.5, 88.7, 88.9, 89.1, 89.3, 89.5, 89.7, or 89.9MHz, which lets you dodge local stations. If you have a factory radio you don't want to pull, this is the version that works.
Historical Context
The MDX-66XLP landed in March 2002, near the end of MiniDisc's commercial life in the US market but squarely in its car-audio prime. Sony's manual copyright confirms the 2002 build, and the deck was made in Japan. The documentation notes it's similar to Sony's prior 6-MD changers, so it sits in an established line rather than starting fresh — the direct-loading scheme and the seamless change behavior are refinements of a formula Sony had been iterating on.
The variant strategy tells you something about the market Sony was chasing. The base MDX-66XLP expects a Unilink head unit; the 66XLPRF expects nothing but an antenna lead and a place to mount a display. That's a company hedging between the enthusiast who'd build a whole Sony system and the commuter who just wanted MD in the car without replacing the dash. Pricing followed the same logic — the US model listed at US$450 on the minidisc.org part page, though the site's own car table shows $299.99, a conflict that's never been resolved and probably reflects different points in the product's life or different retail channels. The 66XLPRF listed at ¥64,000 in Japan.
Availability is listed as "OUT" on minidisc.org, which is ambiguous — it could mean discontinued or simply out of stock. No production end year has surfaced in the documentation.
Collectibility & Value
This is a niche piece even by MiniDisc standards, and the market data is thin. No current sold prices, no documented common failures, no spare-parts availability. What exists is anecdotal: one eBay seller reported testing a unit with a Sony MDX-CA790 head unit, cycling through all discs without issue and running several hours of playback on both standard and MDLP discs with no problems. That's a single data point, but it's a useful one — it confirms the deck plays nice with at least one period head unit and that MDLP playback works in practice, not just on paper.
The manuals.co.uk page carries a user rating of 9.4 from a single reviewer, which is page metadata rather than a substantive review — treat it as a curiosity, not a verdict. The practical collectibility question is whether you can find one with a working mechanism and whether you have the head unit to drive it. The base model's dependence on Unilink makes it a harder sell than the 66XLPRF, which works with any FM radio. Buyers should confirm which variant they're looking at, check that the compartment light and door mechanism function, and test disc changes across all six slots — the seamless-change behavior is the whole point, and a changer that mutes or jams on swap is a paperweight.
Original pricing gives you a ceiling to reason from: US$450 (or $299.99, depending on which page you trust) for the US model, ¥64,000 for the 66XLPRF. Beyond that, the documentation runs dry.
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