Planar vs Dynamic Headphones Explained (HiFiMAN HE400SE vs FiiO FT1)
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Meta Description: Planar magnetic vs dynamic drivers, explained without the hype: how each works, how they actually sound, and amping needs — HE400SE vs FT1 compared.
If you've spent more than ten minutes on r/headphones, you've seen the argument: planar people swear dynamics are slow and smeared, dynamic people swear planars have no punch and need a wall outlet to wake up. Both camps are exaggerating, and both are pointing at something real.
The good news is that in 2026 you don't need to spend four figures to hear the difference yourself. The HiFiMAN HE400SE ($109) is the cheapest planar magnetic headphone worth owning, and the FiiO FT1 (~$150–160 [VERIFY current US price]) is one of the strongest dynamic-driver headphones under $200. This guide covers how each driver type works, what that means for the sound, what it means for your source gear, and which of these two actually fits your situation. Physics first, shopping second.
How a Dynamic Driver Works
A dynamic driver is a tiny loudspeaker: a voice coil glued to a dome or cone diaphragm, suspended in a magnetic gap. Current flows through the coil, the coil moves in the magnetic field, and the diaphragm moves with it, pushing air. This is the same basic motor topology as a 1930s theater woofer, refined over roughly a century.
The defining trait is that force is applied at one point — the coil — and the rest of the diaphragm has to follow along. That puts real engineering pressure on the diaphragm material: it needs to be stiff enough not to flex chaotically at high frequencies (what measurement folks call breakup modes) while staying light enough to start and stop quickly.
The FT1 is a good example of how far this topology has come at a low price. Its driver is 60mm across — genuinely large; most full-size headphones run 40–50mm — with a roughly 0.1mm diaphragm made from a wood-fiber composite (FiiO says the pulp comes from aged Northern European spruce, reinforced with carbon fiber). The engineering logic of a big driver is simple: more surface area means less excursion for the same volume level, which means lower distortion, especially in the bass.
Dynamic drivers' structural advantages: they move a lot of air per watt, they're efficient, and decades of manufacturing maturity mean a well-tuned one is cheap to build.
How a Planar Magnetic Driver Works
A planar magnetic driver replaces the cone-and-coil assembly with a thin film stretched flat like a drumhead, with a conductive trace etched across its surface. Magnet arrays sit on one or both sides of the film. When signal flows through the trace, the entire diaphragm is the voice coil — force is distributed across the whole surface instead of being concentrated at a center point.
Two things follow from that. First, the diaphragm moves as a nearly uniform flat plane, so it doesn't need to be stiff, so it can be extremely thin and light. Low moving mass means fast settling and low stored energy. Second, because there's no single-point drive and no resonant enclosure tricks involved, planars tend to stay linear down into the sub-bass — the bass doesn't need a mid-bass hump to sound extended.
The cost side of the ledger: those magnet arrays are heavy and expensive, and planars typically convert power to sound less efficiently than dynamics — which is exactly why the amping question follows this driver type around.
The HE400SE is the budget landmark here. It uses HiFiMAN's Stealth Magnet design — magnets shaped to reduce acoustic reflections and turbulence as sound passes through the array — trickled down from headphones that cost ten times as much. A decade ago, planar magnetic at $109 didn't exist.
What the Difference Actually Sounds Like
First, an honest disclaimer that most driver-war threads skip: tuning matters more than driver type. A well-tuned dynamic beats a badly tuned planar every single time, and vice versa. What driver type sets is tendencies — the things each topology does easily versus the things it has to fight for.
With that said, the tendencies are real:
Bass character. Planar bass is linear and textured — the level at 30Hz is about the level at 80Hz, and you can follow individual bass notes rather than a general thump. But that same linearity is why planars are often described as lacking "slam": there's no resonant overshoot adding physical punch. Dynamic bass, especially from a large driver in a closed cup like the FT1's, has weight and impact you feel. Neither is wrong. Electronic and hip-hop listeners often prefer the dynamic presentation; acoustic bass and pipe-organ listeners often prefer the planar one.
Transients and detail. The low moving mass of a planar film shows up on fast, dense material — snare rolls, plucked strings, busy metal riffs stay separated where cheaper dynamics can blur. The HE400SE punches well above $109 on this specific axis.
Distortion behavior. Planars generally keep distortion low even at high listening levels and low frequencies, because the evenly-driven film isn't being deformed from a single drive point. Big modern dynamics like the FT1's 60mm unit close most of this gap at sane volumes.
Timbre. Subjective, but frequently reported: dynamics tend to sound "organic" and familiar — we've all spent our lives listening to cone speakers — while planars can have a distinctive treble character and a drier, more matter-of-fact presentation that some listeners love and some never warm up to.
The Caveat Nobody Mentions: Open vs Closed
Here's where we have to be straight with you: the HE400SE is open-back and the FT1 is closed-back, so this comparison entangles two variables. Some of what you'll hear switching between them is the enclosure, not the driver.
Open backs breathe — wider stage, more natural spatial presentation — but they leak sound in both directions. Everyone in the room hears your music, and you hear the room. Closed backs isolate and give bass a pressure-vessel assist, but the cup itself can add resonances and the presentation sits closer to your head.
At this price bracket the pairing is still fair, because these are the two doors most people actually walk through: the entry planar happens to be open, and the standout entry dynamic happens to be closed. Just know that "planar soundstage" praise is partly open-back soundstage praise.
Power and Amping: Read the Numbers, Not the Forum Posts
Both headphones are 32Ω, so the difference is all in sensitivity — and it's bigger than it looks.
The FT1 is rated at 98dB/mW (113dB/Vrms). The HE400SE is rated at 91dB — HiFiMAN doesn't state the convention, but dB/mW is the industry norm [VERIFY measurement convention]. A 7dB sensitivity gap means the HE400SE needs roughly five times the power for the same volume.
Run the numbers for 110dB peaks (loud, but that's where dynamic-range headroom lives):
- FT1: about 16mW, or 0.72Vrms. Any phone dongle made this decade does this without breathing hard.
- HE400SE: about 79mW, or 1.6Vrms. Typical phone dongles top out around 1Vrms into 32Ω — which gets the HE400SE to roughly 106dB peaks. Listenable, but you're at the ceiling with zero headroom.
Translation: the FT1 needs nothing. The HE400SE technically works from a phone, but a $60–150 dongle or desktop DAC/amp — something like the [product: fiio-k11] — is the difference between "fine" and hearing what the driver actually does. We'd rather tell you that before you buy than have you blame the headphone.
One more wrinkle: the FT1 ships with both a 3.5mm cable and a 4.4mm balanced cable, so if you already own a source with a balanced output, you're covered out of the box — genuinely unusual at this price.
HE400SE vs FT1: Spec Comparison
| Spec | HiFiMAN HE400SE | FiiO FT1 |
|---|---|---|
| Driver | Planar magnetic, Stealth Magnet design | 60mm dynamic, wood-fiber composite diaphragm |
| Enclosure | Open-back | Closed-back (black walnut or beech cups) |
| Impedance | 32Ω | 32Ω |
| Sensitivity | 91dB [VERIFY convention] | 98dB/mW @ 1kHz (113dB/Vrms) |
| Frequency response (mfr.) | 20Hz–20kHz | 10Hz–40kHz |
| Weight | 385g | 340g (without cable) |
| Cup connectors | Dual 3.5mm | Dual 3.5mm TRS |
| Included cables | 3.5mm cable + 6.35mm adapter | 3.5mm and 4.4mm balanced cables + 6.35mm adapter |
| Price | $109 | ~$150–160 [VERIFY] |
A note on those frequency-response rows: manufacturer FR specs without a tolerance window (±3dB, etc.) aren't comparable between brands. The FT1's "10Hz–40kHz" doesn't mean it out-extends the HE400SE in any audible way — treat both numbers as marketing shorthand, and trust measurements from independent reviewers instead.
The HE400SE in Practice
The [product: hifiman-he400se] is the headphone we point to when someone asks what "planar speed" means without spending real money. Detail retrieval and instrument separation embarrass its price tag, the tuning is close enough to neutral that nothing sounds obviously wrong, and the open-back stage is wide for the class.
The honest trade-offs: bass is present and clean but doesn't slam; it wants more voltage than a phone provides; it leaks sound like every open back; and at 385g it's not featherweight, though the yoke and pad design distribute it reasonably. This is a quiet-room, sit-down headphone. Used that way, it's one of the easiest recommendations in audio.
The FT1 in Practice
The [product: fiio-ft1] is the opposite personality: warm, weighty, immediate, and completely undemanding. The 60mm wood-fiber driver delivers the kind of bass texture and impact that used to require several hundred dollars, the walnut or beech cups look like far more expensive hardware, and 98dB/mW sensitivity means it runs happily from a laptop jack.
Trade-offs here too: the closed stage is more intimate than spacious, the warm tilt means it's not a neutrality-first tuning, and passive isolation is decent rather than noise-canceling-grade. If your listening happens in shared spaces, on one desk-to-couch cable length, straight from whatever source is nearby — this is the one built for your life.
Which One Should You Buy?
Skip the ideology and answer three questions:
Where do you listen? Quiet room alone: HE400SE. Shared apartment, office, anywhere a leaking open back is a problem: FT1, no contest.
What's your source? Own (or willing to buy) a dongle or desktop amp: HE400SE scales with it. Phone and laptop only, forever: FT1.
What do you listen for? Detail, separation, stage, acoustic timbre: HE400SE. Bass impact, warmth, energy, isolation: FT1.
Plenty of people eventually own both — an open planar for home and a closed dynamic for everywhere else is arguably the smartest $270 two-headphone setup you can build right now. Both ship free in the US (orders $49+), and both come with our 45-day return window, so picking "wrong" costs you a repack, not a restocking fee.
FAQ
Do planar magnetic headphones like the HE400SE need an amp?
Need is strong; benefit is accurate. At 91dB sensitivity and 32Ω, the HE400SE will play from a phone dongle, but you'll be near the volume ceiling with no headroom for dynamic peaks. A modest dongle DAC or desktop amp (1.5Vrms+ into 32Ω) lets the driver perform the way it was designed to. The FT1, at 98dB/mW, genuinely needs nothing beyond a headphone jack.
Is planar always better than dynamic?
No, and anyone who says so is selling something. Planars tend to win on bass linearity, transient speed, and low distortion; dynamics tend to win on efficiency, bass impact, and natural timbre. Flagship headphones exist on both sides — as do bad headphones. Tuning quality decides more than driver topology does. Buy for your music, your space, and your source gear, not for the technology label.
What if I pick the wrong one?
That's what the policies are for. TonePier is an authorized retailer for both HiFiMAN and FiiO, so everything is factory-sealed with a full 1-year warranty, you get 45 days to return it, and US shipping is free on orders over $49. Try the one that fits your situation on paper; if your ears disagree, swap it.