General / Packaging / Build / Comfort
FiiO's JadeAudio sub-brand has been quietly building a reputation for cramming genuinely capable planar drivers into headphones that don't demand a small loan to buy. The JT9 sits right above the JT7 in that lineup, and to my ears it's less a sidegrade and more the JT7 that finally figured out what it wants to be.
Packaging is simple, white cardboard, no frills. Inside you get the JT9 itself, a proper hard carrying case (not just a pouch, which is a nice step up), a 3.5mm single-ended cable, a 4.4mm balanced cable, a 6.35mm adapter, and the manual. No spare pads, but honestly you won't need them, the case can also be purchased separately, NEST series.
Build quality punches above its price. The headband is metal with a springy clamp that's firm without ever feeling like it's trying to crush my skull, and the earcups themselves use a mix of plastic and metal grille work. At 365g it's genuinely light for a planar of this size, and the cups fold flat and rotate inward for storage, so the whole thing collapses down nicely into that case.
Comfort-wise, the hybrid pads (pleather on the outer edges, fabric where it touches skin) do a good job of balancing seal with breathability. Since this is open-back, heat buildup is basically a non-issue, even during longer sessions. Clamping force is on the firmer side out of the box, but nothing that gave me discomfort over a few hours. Just don't expect any isolation, this thing leaks sound both ways, so it's a home/desk headphone through and through, not something to bring on the MRT.
Gears Used for This Review
Aune S18 Evo DAC
Aune S17 Pro Amp
Burson Conductor Stellar
FiiO M33 R2R
xDuoo Link3
FiiO K17 R2R
Foreword
My review is solely based on what I hear via my equipment and I never consider my reviews to be objective in any way rather a subjective approach. Do take into consideration that everyone's ear anatomy is not the same, so the psychoacoustics perception might be different as well, but i believe it will not stray too far.
Sound Impression
Ran the JT9 for about 35-40 hours on my burn-in rig before critical listening. The treble settled slightly and sounds more refined after, though the difference isn't night and day, the JT9 already sounds fairly composed out of the box.
Tonally, this is a warm, moderately V-shaped planar. Bass and treble both get a lift relative to a flat mid, but neither one runs away from the other, so it never tips into "exciting for the sake of exciting" territory. To my ears the overall signature reads as fun-leaning-funalytical: there's enough technical grip underneath the warmth that it doesn't just sound like a bassy headphone with rolled-off detail.
Bass
Extension is genuinely impressive for an open-back planar, sub-bass digs deep and doesn't feel like it's running out of room.
Quantity is elevated but controlled, this isn't a basshead can, but there's real weight and physicality behind kick drums and low synth work.
Speed is what you'd expect from a large planar diaphragm: fast attack, clean decay, no overhang or bloom.
Doesn't bleed into the mids at all, even when I pushed volume up on bass-heavy EDM and orchestral tracks, the lower midrange stayed clear.
Texture is slightly on the softer side rather than razor-tight, which actually works in the JT9's favor, it reads as natural rather than clinical.
Mids
Lower mids are pulled back very slightly to make room for that bass shelf, but it's a deliberate, well-judged tuning choice rather than a hole. Vocals never sound thin because of it.
Male vocals carry good chesty weight, there's body and warmth without sounding congested.
Female vocals have a touch of forwardness and enough upper-mid energy to sound engaged and textured, not flat or veiled.
Picture the vocalist as roughly 4-5 steps in front of you, not shoved in your face, but not buried behind the instrumentation either.
Instrument separation in denser mixes is solid, guitars and vocals don't smear into each other even on busier arrangements.
Treble
Airy and extended, with good sparkle on cymbals and percussion without turning splashy.
Smoother than most headphones at this price bracket, there's an elevated presence but it never crosses into shoutiness or fatigue.
Microdetail retrieval is a genuine strength, background layers and studio ambience come through clearly.
A tinge of extra energy sits in the upper treble that some very treble-sensitive listeners might notice on already-bright recordings, but for the vast majority of material it's a non-issue.
Soundstage / Imaging
Soundstage is the JT9's biggest party trick, it's spacious, holographic, and genuinely larger than life for the price.
There's a hall like effect on live recordings and orchestral material, proper front-to-back layering and width that most affordable planars don't get close to.
Imaging is good but not the most pinpoint I've heard, edges of individual images have a slight diffusion rather than being razor-etched. Purely nitpicking given what this costs.
Nothing about the stage feels 2D-ish, height and depth are both present, which is what gives it that out of head quality on well-recorded tracks.
Driveability
FiiO M33 R2R: Drives the JT9 with ease, plenty of headroom, dynamics stay composed even at higher volumes, gives the overall noteweight a slight lift from the warmer characteristics of R2R
Aune S18 Evo + Aune S17 Pro Amp: This is where the JT9 really opens up, bass control tightens further and the whole presentation feels more authoritative and effortless.
Burson Conductor Stellar: Adds a touch more weight and grip to the bass without changing the tonal balance, a very synergistic pairing, but not required in order to bring out the best of JT9
xDuoo Link3 / FiiO K17 R2R: Perfectly usable, the JT9 doesn't demand serious power and these dongles get it to comfortable listening levels without strain.
Mid range dongle will do just fine, but a proper source will get more out of it, particularly in bass authority and dynamic headroom.
Comparison vs FiiO JT7
Build-wise both share the same headband and folding mechanism, but the JT9's cups, driver, and pads are all new. Sonically it's not close. The JT7 leans neutral and a little thin by comparison, while the JT9 brings noticeably more bass weight, a more refined treble, and a soundstage that feels considerably bigger and more three-dimensional. If you already own a JT7, I'd genuinely tell you to pass it along to a friend and get the JT9 instead. I would personally go for the JT9 here, no contest.
vs HIFIMAN Sundara
The Sundara is more neutral-leaning and analytical, with a flatter midrange and less bass quantity than the JT9. It's the more "reference" of the two, but it also asks for more power to sound its best and doesn't have the same sense of scale in its staging. The JT9 is the more immediately engaging listen out of the box, with better bass authority and an easier time being driven well. For pure tonal accuracy the Sundara has a slight edge, but for value and overall enjoyment I'd go for the JT9.
Final Thoughts
The JT9 is one of those rare affordable planars that doesn't feel like it's making excuses for its price. FiiO clearly took the lessons from the JT7 and applied them properly this time around, more bass weight without losing control, a treble that's actually pleasant to listen to for hours, and a soundstage that has no business sounding this big at this price point. It's not a perfect headphone, imaging could be a hair more precise and the laid-back vocal presentation won't be for everyone, but as a complete package for home desk listening, it does everything right. Recommended? Yes! Definitely!
The FiiO JadeAudio JT9 was sent over by FiiO for the purpose of this review. Big thanks to the FiiO team for the support and opportunity as always.
Head over to their store if you are interested in getting a pair:
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