A Machine That Almost Didn’t Exist

Here’s a popular take that deserves some friction: the FiiO CP13 is a modern Walkman for the cassette-curious. You’ll see it framed that way everywhere. Sleek aluminum body, retro colorways, a USB-C port where the AA battery compartment used to be. The comparison writes itself. But it’s wrong, or at least incomplete, and living with the CP13 for any real stretch of time makes that obvious. This is not a Walkman. It’s something weirder and more interesting than that.

The supply chain for cassette players is nearly non-existent, and the initial stages of the CP13 project were so difficult they nearly led FiiO to cancel it entirely. Only after investing serious time, effort, and deep cooperation with suppliers was the company able to continue. That’s not a marketing anecdote. In the last 30 years, the knowledge of designing portable cassette players has simply been lost. The original inventors and engineers have left the workforce, the production lines have disappeared, and the supply chain does not exist anymore. Companies like FiiO had to start again from scratch.

Think about that for a second. We can put a DAC the size of a thumbnail into a dongle, but the institutional knowledge needed to build a reliable tape transport evaporated while nobody was watching. There is currently only one tape mechanism available, which consists mainly of plastic parts and low-quality toneheads. FiiO didn’t choose minimalism. They negotiated with reality.

What’s Inside the Box (and What Isn’t)

FiiO optimized the CP13 for superior playback by sourcing high-quality cassette components and focusing on simplified design. By removing features like recording and autoreverse, they enhanced audio fidelity and stability. The key to this is an oversized pure copper flywheel, measuring 1.2 inches in diameter and 0.16 inches thick, ensuring consistent playback with minimal wow and flutter. The motor runs at 4.2V, more than the 1.8V or 3V typically found in today’s cassette players. Running the classic JRC5532 low-noise dual operational op-amp allows for up to 600Ω output drive capability. That last detail matters. Today’s headphones are not the foam-padded Koss Porta-Pros of 1984. The CP13’s amp section can actually push serious cans, which no vintage Walkman could do without a separate amplifier.

What’s missing? A lot. The Sony Walkmen from 30 years ago featured recording function, different noise reduction technologies, tape type selector, bias, audio reverse, sensor buttons, mega bass, A-B repeat, AVLS, playtime of several tens of hours on a single AA cell, and they were much smaller than the FiiO CP13. There’s no Dolby noise reduction of any kind. There is no normal, high bias, CrO₂ metal tape selector, no Dolby noise reduction — “gone is the day of licensing any type of this tech.” No belt clip. No auto-reverse. No line out. The built-in lithium battery is not user-replaceable. It ships with an orange warning card explaining that hiss and background noise may be noticeable. That card is either refreshingly honest or deeply funny, depending on your relationship with magnetic tape.

So How Does It Sound?

With a clean Type I ferric tape, sitting flat on a desk, the CP13 sounds genuinely good. Warm, present, with a slight brightness that gives vocals an almost crystalline edge. Reviewer Jürgen at AudioReviews put it well: “The $99.99 FiiO CP13 cassette player features an upgraded version of the only available tape mechanism on the market paired with a superior modern amplifier for good-quality analog sound.” The FiiO is a fancy metal design with a heavy and firm metal potentiometer. The player feels overall more substantial compared to old Walkmans.

But here’s where the counter-narrative kicks in. Pick up the player. Walk with it. Put it in a jacket pocket. The Fiio’s got rolling issues worse than any other cassette player one reviewer had ever tested. The sound quality will change depending on whether the device is sitting flat on its back or on another side. If you’re walking around, the sound will cut out frequently and may come back sounding muted as the components and tape can move around enough to go out of alignment. Durwood at AudioReviews coined the distinction perfectly: “My experience with the CP13 transforms my idea of a portable cassette player to rather a transportable cassette player.”

That word — transportable — is the key to understanding this device. A Walkman earned its name by walking with you. The Sony WM-F2015 does not suffer from tracking issues, truly earning the “Walkman” title. The CP13 earns something else. It’s a beautiful desktop tape player that happens to have a battery.

The Azimuth Problem Nobody Warned You About

Azimuth — the precise angle at which the tape head meets the tape — is the quiet heartbreak of the CP13. Multiple reviewers had to adjust the azimuth of the head on the FiiO. Out of the box, it sounded muted, as the head was misaligned. It was easy to fix well enough, but to do it properly, you need more equipment than most people have access to. The FiiO CP13 seems very sensitive to azimuth variations; even a basic Sony WM-F2015 and a worn-out budget Aiwa TA117 had better azimuth tracking. One reviewer’s DIY fix involved quarter-inch weather stripping from a hardware store, cut into small strips and placed in the tape tray. That’s the kind of workaround that’s charming in a hobbyist context and alarming in a consumer product.

Even with careful factory calibration, azimuth still varies with every individual machine. FiiO does at least provide accessible adjustment screws, and the company thankfully offers adjustment of both speed and azimuth, so if in the future they drift there is a way to correct them. But the fact remains: this is a player that sometimes needs a screwdriver before it sounds right.

The Honest Truth About Where This Fits

The popular framing is that the CP13 is a nostalgia play, a novelty for people who want to feel something while they listen. I think that undersells what FiiO actually accomplished. The company admits they haven’t made much profit from these retro products. The CP13 did generate some modest earnings, but FiiO reinvested all of it into the molds for new mechanisms and motors. That’s not a cash grab. That’s a company funding R&D for a dead format’s future with the slim margins of its present.

The successor, the CP15, will feature an electronically controlled mechanism and a brushless motor, significantly reducing size and thickness while greatly enhancing the user experience. The supplier is still working on the mold. On Head-Fi.org, FiiO confirmed that the CP15 uses “a reproduced movement that’s an electronically controlled brushless motor that won’t have this problem anymore.” Logic-controlled buttons. Thinner body. The rolling and azimuth issues, presumably, addressed at the root.

Which makes the CP13 something specific and, I think, worth respecting: a first draft. Not a first draft that pretends to be finished, but one that wears its compromises openly. It comes with a literal warning label. It can’t walk with you. It needs you to own a screwdriver and a little patience. As one reviewer put it, “a well-built unit with room for improvement, definitely cool.”

At $99.99 from most retailers, with the transparent version running closer to $129, the CP13 is cheaper than most refurbished vintage Walkmans on eBay — and those come with their own risks of disintegrated belts and dead capacitors. It won’t replace a mint-condition WM-DD30. Nothing will. But if you’ve got a shoebox of tapes and a pair of good headphones and a flat surface, the CP13 will play them with a clarity and warmth that the Amazon no-name players cannot touch. Just don’t try to jog with it.

The FiiO CP13 is available now from FiiO, reviewed at Headfonics, and AudioReviews.