Short answer: the HEDD Heddphone 2. It ranks #344 of 481 over-ear headphones by sound quality, rated 3.0/5, at $1,999; the ZMF Atrium ranks #362, rated 2.9/5, and costs $2,499.99, so there is not much of a tradeoff to weigh.
What the HEDD Heddphone 2 does well: A full range Air Motion Transformer driver sets it apart from conventional dynamic and planar designs, and the open back gives a spacious presentation. The catch: oratory1990’s measurement shows treble about 8.9 dB below target with an 11.8 dB dip near 9.6 kHz, which leaves cymbals and air sounding muffled, and sub-bass falls 6 dB short by 47 Hz.
Why pick 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 catch: 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 HEDD Heddphone 2. It is rated higher for sound quality than the ZMF Atrium and costs less, so only choose the other one for a particular feature it does better.
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A full range Air Motion Transformer driver sets it apart from conventional dynamic and planar designs, and the open back gives a spacious presentation.
HEDD $1,999.00 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
| HEDD Heddphone 2 | ZMF Atrium | |
|---|---|---|
| Price | $1,999.00 | $2,499.99 |
| Ranked | #344 of 481 in Over-Ear Headphones | #362 of 481 in Over-Ear Headphones |
| Form Factor | Over-ear | Over-ear |
| Harman Preference Score | 60 (measured by oratory1990, via AutoEQ) | 58 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 3.17 dB standard deviation | 3.08 dB standard deviation |
| Tonal Tilt | -0.95 (negative is warmer, positive brighter) | -1.12 (negative is warmer, positive brighter) |
| Sub-bass Extension | Falls 6 dB below target at 47 Hz (-7.7 dB at 30 Hz) | Falls 6 dB below target at 28 Hz (-5.8 dB at 30 Hz) |
| Connection | Wired | Wired |
| Back | Open | Open |
| Driver Type | Air Motion Transformer | Dynamic |
| Drivers | 1 x Air Motion Transformer (full range) | 1 x dynamic (biocellulose) |
| Impedance | 41 ohms | 300 ohms |
| Sensitivity | 89 dB/mW | 96 dB/mW |
| Weight | 1.2 lbs (550 g) | 1.1 lbs (490 g) |
| Frequency Response | 10Hz - 40kHz (Manufacturer specified) | - |
| Built-in Microphone | No | - |
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