TANGZU made its name in the IEM world, and it did so fast. The Wan’er S.G. became a community favourite practically overnight. But building a full-sized planar magnetic headphone is a different game entirely, and that is exactly what the TANGZU OX Demon King attempts.
Priced at $349, the OX Demon King is TANGZU’s first headphone. It carries an 85mm planar magnetic driver inside a stunning CNC-machined aluminum shell. The question is whether this debut delivers on the brand’s strong reputation or stumbles at the first hurdle.
Short answer: it mostly delivers. Here is everything you need to know.
TANGZU OX Demon King Overview
The OX Demon King is a full-sized, open-back planar magnetic headphone. That 85mm driver sits at the heart of the entire design philosophy, pushing air through both sides of the diaphragm to produce the wide, low-distortion sound that planar fans tend to obsess over.
TANGZU chose an open-back configuration, which means you get a more natural, airy soundstage at the cost of sound isolation. These are headphones meant for a quiet listening room, not a noisy commute.
At $349, the OX Demon King positions itself in a competitive middle tier of the planar market, sitting below flagship territory but well above budget options. According to Statista, the premium headphone segment grew by 11% in 2024, and planar magnetic models have led much of that growth.
Design And Build Quality
This is where the OX Demon King genuinely earns praise. The 5-axis CNC-machined aluminum earcups look unlike almost anything else at this price point. Viewed from any angle, the machined patterns catch light in a way that signals real craftsmanship, not mass production shortcuts.
The metal yoke allows the earcups to swivel flat for storage, and left/right indicators are marked clearly at the top. The headband tensioner is full metal, covered in premium leather with embossed TANGZU logos on each side. Thick, soft head padding completes the package.
The overall construction feels genuinely sturdy. Pull on it, flex it, and nothing creaks. The all-metal build communicates confidence in the product.
One thing worth flagging upfront: this headphone weighs 471 grams. That is not unusual for a planar with this build quality, but it is heavier than many dynamic driver competitors and something to factor in if you plan long listening sessions.
TANGZU OX Demon King Sound Quality
The TANGZU OX Demon King delivers an energetic, fun sound signature. It is not a neutral reference headphone. Instead, it leans into detail retrieval and a lively presentation that makes modern music genuinely enjoyable.
The low end is tight and controlled, as expected from a planar driver. Bass has good texture and extension without becoming bloated or bleeding into the midrange. Kick drums feel physical without dominating the mix.
Midrange is where things get slightly interesting. Vocals and instruments come through with clarity, but the upper midrange has a forward quality that can occasionally feel intense on certain recordings. Listeners who prefer a warmer, more relaxed sound signature should factor this in.
The treble is detailed but bright. Cymbals, hi-hats, and string harmonics all have good air and extension. If you are sensitive to treble forwardness, some tip rolling with EQ may help. For everyone else, this brightness adds to the energetic character of the headphone.
The soundstage is wide and open, as expected from an open-back design. Imaging is precise enough to pinpoint instruments within a mix, a quality that audiophile headphone reviewers consistently cite as a planar strength.
If you enjoy wireless listening with a different sound philosophy, our DALI IO-12 review covers a warmer and more relaxed signature at a higher price tier.
Comfort And Fit
The premium leather ear pads are plush and generously sized. They create a comfortable seal around the ears without excessive clamping force. The headband padding is thick enough to distribute that 471-gram weight reasonably well across the top of the head.
During shorter sessions of one to two hours, comfort is genuinely good. Beyond that, the weight begins to make itself known. This is not a flaw unique to the OX Demon King, but it is part of the planar ownership reality.
The earcup articulation is somewhat limited. They rotate forward for storage but do not swivel vertically as freely as some competitors. Most head shapes will still find a good fit, but those with atypical head geometry may want to audition first.
For a different listening format entirely, see our Sennheiser IE80 review to compare with a legendary in-ear audiophile option.
Technical Specifications
| Driver Type | 85mm Planar Magnetic |
| Design | Open-Back, Full-Sized |
| Impedance | 25 Ohms |
| Sensitivity | 92 dB |
| Weight | 471 grams |
| Connections | Dual 3.5mm |
| Earcup Material | 5-Axis CNC Aluminum Alloy |
| Ear Pads | Premium Leather |
| Price | $349 |
Pros And Cons
| Pros | Cons |
| Stunning 5-axis CNC aluminum build quality | Upper midrange and treble can feel forward |
| Energetic, fun, and detailed sound signature | At 471g, it is on the heavier side for long sessions |
| Wide open soundstage typical of planar drivers | Low 92 dB sensitivity demands a capable amplifier |
| Premium leather pads and headband feel luxurious | Limited movement range of earcups during use |
| Solid brand track record from IEM success |
How It Compares To Competitors
The TANGZU OX Demon King competes most directly with the FiiO JT7 and the MOONDROP Horizon in the sub-$400 planar segment.
Against the FiiO JT7, the OX Demon King offers a more energetic and detailed presentation, though the FiiO tuning can feel smoother in the upper midrange. Build quality on both is strong, but the TANGZU CNC machining gives it a visual edge.
The MOONDROP Horizon is a slightly warmer and more balanced tuning for those who want less treble excitement. It gives up some of the OX Demon King’s liveliness in exchange for longer fatigue-free listening.
At $349, the OX Demon King holds its own value. The build quality punches above its price bracket, and the sound performance offers genuine competition to established planar names that cost more.
Final Verdict
The TANGZU OX Demon King is a strong debut headphone from a brand that has already proven itself in the IEM category. The CNC aluminum build is genuinely beautiful, the planar magnetic sound is engaging and detailed, and the $349 price positions it well in a competitive field.
Its forward upper midrange and treble brightness will not suit every listener, and the weight demands a comfortable chair more than a crowded commute. But for anyone seeking an audiophile headphones review that points toward accessible planar performance with serious build quality, the OX Demon King is worth serious consideration.
TANGZU has announced its arrival in the full-sized headphone segment with confidence. This is not a half-hearted first attempt.
Frequently Asked Questions
Is The TANGZU OX Demon King Worth Buying?
Yes, for most audiophile listeners looking for a planar magnetic headphone under $400. The build quality is exceptional for the price, and the energetic sound signature suits a wide range of modern genres well.
Are planar magnetic headphones better than dynamic driver headphones?
Not always better, but different. Planar magnetic drivers typically offer lower distortion, tighter bass, and more precise imaging. Dynamic drivers can feel warmer and more natural to some ears. The right choice depends on your listening preferences.
Is TANGZU a good audio brand?
TANGZU has built a strong reputation in a short time, particularly with IEMs like the Wan’er S.G. and Zetian Wu series. The OX Demon King confirms that quality is not limited to their earphone lineup.
What is the price of the TANGZU OX Demon King?
The TANGZU OX Demon King retails at $349. It is available through TANGZU’s official store, Linsoul, and Amazon.
Does the TANGZU OX Demon King need an amplifier?
Yes. With a sensitivity of 92 dB and 25-ohm impedance, the OX Demon King benefits noticeably from a dedicated headphone amplifier or DAC/amp combo. A phone or laptop headphone jack will not drive it to its full potential.
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