Short answer: the ZMF Atrium, though neither ranks well in its class. Both are rated 2.9/5 for sound quality (#362 and #370 of 481 over-ear headphones), and the ZMF Atrium costs $2,499.99 against $2,999 for the Focal Stellia, with sound quality a draw, the lower price decides it. Both are rated below 3.0/5 among the 481 over-ear headphones; for better sound, the Dan Clark Audio E3 ranks #1 at $2,299.
Why pick the Focal Stellia: A closed-back design with a beryllium dome driver keeps sound in and outside noise down, and the 35 ohm, 106 dB/mW load runs well from a phone or portable player. Watch for: Presence, treble and air all fall 4 to 7 dB below target, and oratory1990’s measurement shows a 12.8 dB dip near 9.7 kHz, so cymbals and detail sound dull and recessed.
The case for the ZMF Atrium: An open-back dynamic headphone with a biocellulose driver and a warm, bass-leaning tuning, with mid-bass about 2 dB and low mids nearly 2 dB above target for listeners who want a thick, relaxed sound. The tradeoff: In the median of 4 hobbyist measurements on squig.link it scores just 58 for preference, with treble from 6 to 10 kHz about 5.8 dB below target and an 11.5 dB dip near 8.7 kHz that dulls cymbals and detail.
Buy the ZMF Atrium. Both are rated the same for sound quality, and it costs $499.01 less than the Focal Stellia.
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A closed-back design with a beryllium dome driver keeps sound in and outside noise down, and the 35 ohm, 106 dB/mW load runs well from a phone or portable player.
Amazon $2,999.00 eBay
An open-back dynamic headphone with a biocellulose driver and a warm, bass-leaning tuning, with mid-bass about 2 dB and low mids nearly 2 dB above target for listeners who want a thick, relaxed sound.
ZMF Headphones $2,499.99 eBayPrices on this page were last checked October 16, 2026 at 5:46 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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Specifications Side By Side
| Focal Stellia | ZMF Atrium | |
|---|---|---|
| Price | $2,999.00 | $2,499.99 |
| Ranked | #370 of 481 in Over-Ear Headphones | #362 of 481 in Over-Ear Headphones |
| Form Factor | Over-ear | Over-ear |
| Harman Preference Score | 56 (measured by oratory1990, via AutoEQ) | 58 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 3.04 dB standard deviation | 3.08 dB standard deviation |
| Tonal Tilt | -1.27 (negative is warmer, positive brighter) | -1.12 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.5 dB at 30 Hz) | Falls 6 dB below target at 28 Hz (-5.8 dB at 30 Hz) |
| Connection | Wired | Wired |
| Back | Closed | Open |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 40mm dynamic (beryllium dome) | 1 x dynamic (biocellulose) |
| Impedance | 35 ohms | 300 ohms |
| Sensitivity | 106 dB SPL/mW | 96 dB/mW |
| Weight | 1 lbs (435 g) | 1.1 lbs (490 g) |
| Frequency Response | 5Hz - 40kHz (Manufacturer specified) | - |
Frequency Response Compared
Both headphones’ measurements overlaid on the Harman target. Above the target sounds louder in that range, below it quieter. Each curve is the median of several independent measurements, shifted so its 500 Hz to 2 kHz average sits at 0 dB, so only the tuning is compared.
Measurement data: the Focal Stellia from aden, daemonxar, gadgetrytech and vsg; the ZMF Atrium from kuulokenurkka, listener, sai and superreview, all via squig.link.
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