Short answer: the IOAudio Sogno. It ranks #3 of 450 in-ear headphones by sound quality, rated 4.9/5, at $399. The Moondrop Harmon ranks #38, rated 4.7/5, at $349.99, $49.01 cheaper, not enough of a saving to outweigh the sound-quality gap.
Why pick the IOAudio Sogno: Its preference score of 88, taken from the median of six hobbyist measurements, comes with an average deviation of only about 0.8 dB, one of the most even responses among in-ears. Watch for: A 3.3 dB dip near 6.5 kHz next to a 3.6 dB peak near 8.1 kHz can make some cymbals and sibilants sound slightly uneven.
The case for the Moondrop Harmon: Across 10 hobbyist measurements on squig.link it scores 82 for preference, with bass held within about half a decibel of target down to 20 Hz, so low end is clean and controlled. The catch: A deep 6.9 dB dip near 10.3 kHz and treble about 2 dB under target from 6 to 10 kHz make cymbals and acoustic detail sound subdued.
Buy the IOAudio Sogno. It is rated higher for sound quality, and the $49.01 you would save on the Moondrop Harmon does not close the gap.
Looking for alternatives? See the complete Headphones rankings.
Specifications Side By Side
| IOAudio Sogno | Moondrop Harmon | |
|---|---|---|
| Price | $399.00 | $349.99 |
| Ranked | #3 of 450 in In-Ear Headphones | #38 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 88 (median of 6 squig.link measurements, calibrated to AutoEQ) | 82 (median of 10 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 0.84 dB standard deviation | 1.34 dB standard deviation |
| Tonal Tilt | -0.07 (negative is warmer, positive brighter) | -0.26 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.2 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.1 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (2 dynamic + 6 balanced armature) | Dynamic |
| Drivers | 1 x 10mm + 6mm coaxial dual dynamic + 6 x balanced armature | 3 x 10mm dynamic |
| Impedance | 12.8 ohms | 19 ohms |
| Sensitivity | 126.5 dB/Vrms | 114 dB/Vrms |
| Frequency Response | 10Hz - 30kHz (Manufacturer specified) | 10Hz - 60kHz (Manufacturer specified) |
| Built-in Microphone | No | No |
Related Headphone Comparisons
How IOAudio Sogno compares with other leading options:
- AKG N5005 vs IOAudio Sogno
- IOAudio Sogno vs EPZ K9
- EPZ K9 vs Moondrop Harmon
- Moondrop Harmon vs Inawaken Twilight-DS
- Moondrop Harmon vs Tanchjim Soda
Prices on this page were last checked October 11, 2026 at 4:59 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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The Two Headphones In Full
IOAudio Sogno: $399.00 Amazon eBay
Pros: Its preference score of 88, taken from the median of six hobbyist measurements, comes with an average deviation of only about 0.8 dB, one of the most even responses among in-ears. Every broad band from sub-bass to air lands within about 1.3 dB of the Harman target, so bass, vocals and treble all sit in natural proportion. A coaxial dual dynamic woofer with six balanced armatures at 126.5 dB/Vrms plays loudly from a phone. It is rated above the Moondrop Harmon and Tanchjim Soda at a similar price.
Cons: A 3.3 dB dip near 6.5 kHz next to a 3.6 dB peak near 8.1 kHz can make some cymbals and sibilants sound slightly uneven. Only six samples were measured, so unit to unit variation is less well established, and the sensitivity is high enough that noisy sources may hiss. It has no built-in microphone.
Full IOAudio Sogno review and specifications →
| Back | Closed |
|---|---|
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 0.84 dB standard deviation |
| Driver Type | Hybrid (2 dynamic + 6 balanced armature) |
| Drivers | 1 x 10mm + 6mm coaxial dual dynamic + 6 x balanced armature |
| Form Factor | In-ear |
| Frequency Response | 10Hz - 30kHz (Manufacturer specified) |
| Harman Preference Score | 88 (median of 6 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 12.8 ohms |
| Sensitivity | 126.5 dB/Vrms |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.2 dB at 30 Hz) |
| Tonal Tilt | -0.07 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Moondrop Harmon: $349.99 Amazon eBay
Pros: Across 10 hobbyist measurements on squig.link it scores 82 for preference, with bass held within about half a decibel of target down to 20 Hz, so low end is clean and controlled. Three 10 mm dynamic drivers at 114 dB/Vrms play loudly from a phone. The slightly warm, relaxed tuning suits listeners who are sensitive to treble glare.
Cons: A deep 6.9 dB dip near 10.3 kHz and treble about 2 dB under target from 6 to 10 kHz make cymbals and acoustic detail sound subdued. Its rating sits below the IOAudio Sogno and AKG N5005 at a similar price, and there is no built-in microphone.
Full Moondrop Harmon review and specifications →
| Released | May 2025 (1 year ago) |
|---|---|
| Back | Closed |
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 1.34 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 3 x 10mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 10Hz - 60kHz (Manufacturer specified) |
| Harman Preference Score | 82 (median of 10 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 19 ohms |
| Sensitivity | 114 dB/Vrms |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.1 dB at 30 Hz) |
| Tonal Tilt | -0.26 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons