HeadphoneOverreview

FiiO JadeAudio JT9

Name: FiiO JadeAudio JT9
Brand: FiiO

A $160 planar three rigs call near-neutral — and that listeners hear as bassy, V-shaped, or bright.

21 sourcesUpdated 2026-09-15

$160Typical US price

Score aggregates reviewer opinions across topics.

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The short version

What to know.

A ~$160 open-back planar that three measurement rigs read as near-neutral — no bass shelf, a small bump near 1 kHz, a step back at 2 kHz, an on-target 3 kHz ear-gain peak and a few dB of extra energy across 5–8 kHz on one rig — with very low distortion, excellent channel matching and a sensitivity that lets a phone dongle drive it. Sources agree it is an audible step up from the JT7 in bass extension, resolution and dynamics, that the treble is smooth-but-airy rather than harsh, that the mids are clear, that it folds, weighs 365 g and comes with two cables and a case, and that it is very good value. They split on almost everything that describes its character: whether it is neutral or a warm, moderately V-shaped 'fun' tuning; whether the bass is generous for a planar or merely deep and a touch soft; whether the stage is unusually large or natural and intimate; whether imaging is excellent or just average; whether the light, small-cupped fit is all-day comfortable or hit-and-miss; and — the sharpest divide — whether the mostly plastic build is sensible for the money or the same creaky headband that has cracked on JT7s.

About this product

JadeAudio is FiiO's budget sub-brand. The JT9 is the $159.99–$169.99 open-back planar (95×86 mm driver, 20 Ω, 95 dB/mW, 365 g, foldable, 3.5 mm + 4.4 mm cables and a hard case) launched 13 August 2026 above the $109.99 JT7 — same steel-and-plastic frame, new driver, cups, pads and grille — and alongside the $199 FT1 Pro, which shares its diaphragm material but not its driver or chassis. Black now; a Deep Brown edition is announced. Not the closed-back FT1, nor the dynamic JT3/JT1.

FiiO's JadeAudio JT9 is the second open-back planar from the budget sub-brand, arriving nine months after the JT7 became the default 'first planar' recommendation at $110. It keeps the JT7's folding steel-and-plastic frame and adds a new 95×86 mm driver with a 1 μm sapphire-and-aluminium-coated diaphragm, a lower resonant frequency, a metal grille, a second (balanced) cable and a proper hard case — for $160–$170, which puts it within a few dollars of FiiO's own FT1 Pro and well under a HIFIMAN Sundara.

Within a month it had been measured on three different rigs, reviewed by a half-dozen outlets and argued over on Head-Fi and Reddit — and the interesting thing is how little the measurements and the listening notes agree on what it sounds like. The graphs say near-neutral; the ears say warm, V-shaped, bright, bassy and neutral, depending on who's wearing it. Plenty of agreement on the fundamentals, and a lot of disagreement to map.

A good fit for

A first open-back planar under $200 that doesn't need an amplifier
Listeners who want full sub-bass extension without a bass shelf
Smooth-treble seekers who found the Sundara or JT7 a little sharp or thin
Anyone who needs an open-back that folds into a case for desk-to-desk travel
Average or smaller ears and heads (the pads are oval and shallow)

Think twice if

You want a strict reference tuning — most listeners hear it as warm/V-shaped, and the 2 kHz dip is measurable
You are a basshead — there is no shelf, and one bench calls the bass soft
Large ears or a big head: the cup opening is ~60 × 45 mm and the clamp is light
Long-term durability worries you — it shares the JT7's plastic headband and yokes
You need isolation or want to use it in public
You already own a JT7 and are happy with its bass — the upgrade is arguable

The reviewer consensus

Agreement &
disagreement.

6 / 12topics divide opinion

5 Strong agreement1 Mostly agree6 Divided opinions

Common ground7

A real step up from the JT7 — deeper bass, better resolution, more dynamic contrast — for $50 more
Smooth, extended, non-fatiguing treble that nobody reviewing a retail unit calls harsh
Clear, natural mids with good vocal weight
Fast, effortless dynamics and very low distortion; goes loud without strain
Genuinely easy to drive for a planar (20 Ω, ~95 dB/mW) — a phone dongle or laptop is enough, though it scales
Strong value: two cables, a hard case and a folding frame at $160
No isolation and full leakage — open-back, despite the travel-friendly case

Points of contention6

Tonality — neutral and natural (the benches, Audio Rabbit Hole) vs warm, bassy and moderately V-shaped, or lively and bright (most listening reviews)
Bass — generous, dynamic-driver-like weight for a planar vs neutral quantity, deep but a touch soft; the rigs also disagree on whether it truly reaches 20 Hz
Soundstage — unusually large and spherical vs natural and intimate; depends on whether the reference is the JT7 or an egg-cup HIFIMAN
Imaging — excellent positional accuracy (PCMag, in games) vs 'not bad, just average' (Headfonics) and not for competitive gaming (Ianbanz)
Comfort — light and all-day for most vs small cups sitting on the ear and a too-light clamp for some
Build — sensibly built for the money vs plasticky, creaky, and wearing the same headband that has cracked on JT7s

A closer listen.

12 topics · 6 divided

Left: criticalRight: positiveTighter lines: more agreement

Choose a topic

Tonality

Leans positiveDivided opinions

Reviewer sentiment10 supporting sources

CriticalNeutralPositive

Band: opinion spread · Dot: weighted average

Sources split on what the JT9 is. The two measurement-led reviewers and Audio Rabbit Hole call it neutral, natural and free of obvious colouration — one bench names it the sub-$200 tonality of the year. Most of the listening reviews hear colour: warm and bassy with a moderately V-shaped balance (Headfonics, the Reddit owners, Ianbanz), or lively and slightly bright with a lifted presence region (PCMag). The graphs sit closer to the first camp; the second camp is describing the extension at both ends and the 2 kHz step-back as emphasis.

Measured

Three rigs agree on the shape from 40 Hz up: bass and lower mids within ~1 dB of 500 Hz, a ~1 dB bump near 1–1.2 kHz, a 3–4 dB step down at 2 kHz relative to the JT7 (Pragmatic Audio's KB501X and Jaytiss's B&K 5128 both show it), a ~12 dB ear-gain peak at 3 kHz that sits on target, and — on the 5128 — 5–8 kHz running 3.6–5.1 dB above a tilted diffuse-field target. DIY-Audio-Heaven's flatbed reads the treble 'on the correct level'; Pragmatic Audio scores the JT9 4.7 dB RMS from its tilted target across 1–8 kHz (JT7 4.8, Sundara 3.6).

vs. listeners — The graphs support 'neutral' below 2 kHz and 'a little extra air' above 5 kHz; 'V-shaped' is the combination of full sub-bass extension, the 2 kHz dip and that upper-treble energy heard as a smile. Nobody measures a bass shelf, so 'bassy' is extension without a hump.

Where it splits

Neutral and natural — no obvious colouration, a reference-grade tuning for the money.36%

“The sound is ‘natural’ and pleasant without any obvious colorations.”
DIY-Audio-Heaven (Solderdude)

Coloured and fun — warm, bassy and moderately V-shaped (or, to one reviewer, lively and bright).64%

“The JT9 has a warm, bassy, moderately V-shaped tonality with a larger-than-life sound presentation.”
Headfonics (Marcelo)

Link to this topic

Bass

PositiveDivided opinions

Reviewer sentiment11 supporting sources

CriticalNeutralPositive

Band: opinion spread · Dot: weighted average

Everyone agrees the low end is the biggest change from the JT7 and that it extends deep and stays clean. They split on quantity and texture: one camp hears a genuinely bassy planar — dynamic-driver-like weight and sub-bass rumble that surprised them in an open-back — while the benches and PCMag hear neutral quantity: linear, no mid-bass hump, 'not a basshead set', and to DIY-Audio-Heaven a little soft and woolly rather than tight. The measurements side with the second camp on quantity and with the first on extension — on two of the three rigs.

Measured

No bass shelf on any rig — 40–200 Hz sits within ~1.3 dB of 500 Hz on both the KB501X and the B&K 5128. Extension is where the rigs disagree: DIY-Audio-Heaven reads 22 Hz at −3 dB and 'exceptionally seal-loss resistant'; Pragmatic Audio's KB501X has the JT9 within 1.7 dB of its 500 Hz level at 20 Hz, 4.2 dB above the JT7 and level with the Sundara's better channel; but on Jaytiss's 5128 the JT9 and JT7 roll off identically (about −7 dB at 20 Hz). Second-harmonic distortion peaks ~0.7 % at 20 Hz and stays under 0.2 % through the mids (PA); no compression up to ~95 dB SPL (DIY-AH).

vs. listeners — 'Prodigious bass' and 'bass heads will need more' are the same flat response heard against different references — most planars at this price roll off where the JT9 (on two rigs) doesn't, so full extension reads as generosity to some ears. The soft-vs-tight split has no measured correlate: distortion is low and the 40 Hz square wave is clean.

Where it splits

Generous for an open planar — weighty, deep, dynamic-driver-like bass that stays clean.46%

“There is a healthy amount of effortless low-bass presence, as if I’m listening to a dynamic-driver headphone, unlike most planar headphones, which have tight but stingy bass presence.”
Headfonics (Marcelo)

Neutral in quantity — deep and linear but not for bassheads, and a touch soft in texture.54%

“Bass levels will not satisfy bass heads but are not lacking and bass extension is good. Bass is a bit ‘soft’ in texture and does not ‘hit hard’ nor is it particularly ‘tight’ but of good tonality.”
DIY-Audio-Heaven (Solderdude)

Link to this topic

The hardware

Specifications.

Checked 2026-09-22

Design

Type: Open-back
Drivers: 1 × 95 mm planar magnetic (1µm PET diaphragm, sapphire+aluminum dual coating)

Electrical

Impedance: 20 Ω
Sensitivity: 95 dB/mW≈ 112 dB/V
Frequency response: 7 Hz – 40 kHz

Connection

Cable: Detachable, dual-entry, 1.5 m
Connector: 3.5 mm
Plugs supplied: 3.5 mm, 4.4 mm balanced, 6.35 mm

Physical

Weight: 365 g

Manufacturer-published figures, not measurements · from apos.audio, fiio.com.

Follow the evidence

Sources 21

Read with context

Limitations & method.

As of 2026-09-15

What to keep in mind 6

A read of where the reviews land as of mid-September 2026, one month after launch — most of the outlets and channels that covered the JT7 haven't published on the JT9 yet, and long-term durability reports don't exist. The picture will move.
Three measurement rigs were compared, and they disagree below 40 Hz: two show the JT9 reaching 20 Hz, one shows it rolling off like the JT7. Different fixtures and seals read sub-bass differently, so treat 'extends to 20 Hz' as likely rather than settled.
Nearly every reviewer received the headphone from FiiO. All disclose it and none is paid, but a free sample still shapes who writes about a product first. Retail owner ratings are too few to report — Amazon had a single review at the time of writing.
Several of the voices online are the same person in different places — a YouTube channel, a Head-Fi review and a Facebook group post can be one reviewer. Those were counted once here.
How much bass, how big a stage and how forward the vocals seem all depend on what you are coming from: JT7 owners hear a big step, Sundara and Edition XS owners hear a sidestep. Pad swaps (the FT1 pads fit) change the tuning measurably.
Comfort and the build verdict both hinge on your head: small or average ears sit inside the pads, larger ones sit on them, and the headband that worries the critics is the JT7's — which has cracked for some owners and lasted fine for others.

Where to buy Product & retailer links

FiiO JadeAudio JT9 Amazon

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FiiO JadeAudio JT9

How the score adds up

What to know.

A good fit for

Think twice if

Agreement &
disagreement.

Common ground7

Points of contention6

A closer listen.

Tonality

Measured

Bass

Measured

Mids

Measured

Treble

Measured

Soundstage

Imaging

Measured

Detail

Dynamics

Measured

Comfort

Measured

Build

Isolation

Value

Specifications.

Design

Electrical

Connection

Physical

Sources 21

Limitations & method.

What to keep in mind 6