Short answer: the 7Hz Eternal. It ranks #345 of 450 in-ear headphones by sound quality, rated 3.6/5, at $249; the Sennheiser MOMENTUM True Wireless 4 ranks #368, rated 3.3/5, and costs $249.95, so there is not much of a tradeoff to weigh.
The 7Hz Eternal is the better-sounding pick. Crinacle’s measurement gives it a preference score of 69, and squig.link measurements show bass, mids and upper mids all within about 1 dB of target, so voices and instruments sound natural. The catch: Treble above 6 kHz drops 3 to 4 dB below target with an 8.7 dB dip near 10.6 kHz, so cymbals lack sparkle and detail sounds dim.
What the Sennheiser MOMENTUM True Wireless 4 does well: This true wireless set adds active noise cancelling, Bluetooth 5.4 and a codec list that runs from SBC and AAC up to aptX Lossless and LC3. The tradeoff: Presence from 3 to 6 kHz is about 6.9 dB under target, with an 8.2 dB dip near 5.7 kHz, so voices and guitars sound recessed.
Buy the 7Hz Eternal. It is rated higher for sound quality than the Sennheiser MOMENTUM True Wireless 4 and costs less, which makes it the one to get unless you need something the other one does better.
Looking for alternatives? See the complete Headphones rankings.
Specifications Side By Side
| 7Hz Eternal | Sennheiser MOMENTUM True Wireless 4 | |
|---|---|---|
| Price | $249.00 | $249.95 |
| Ranked | #345 of 450 in In-Ear Headphones | #368 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 69 (measured by crinacle, via AutoEQ) | 65 (measured by oratory1990, via AutoEQ) |
| Deviation From Target | 2.63 dB standard deviation | 2.63 dB standard deviation |
| Tonal Tilt | -0.36 (negative is warmer, positive brighter) | -0.74 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.1 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-1.4 dB at 30 Hz) |
| Connection | Wired | True wireless |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 14.5mm dynamic | 1 x 7mm dynamic |
| Impedance | 30 ohms | - |
| Sensitivity | 109 dB/1kHz | - |
| Weight | 0 lbs (6 g) per earbud | 0 lbs (6.2 g) per earbud |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) | - |
| Built-in Microphone | No | Yes |
| Active Noise Cancelling | - | Yes |
| Battery Life | - | 7.5 hours (30 with case, Manufacturer specified) |
| Bluetooth Version | - | 5.4 |
| Bluetooth Codecs | - | SBC, AAC, aptX, aptX Adaptive, aptX Lossless, LC3 |
| IP Rating | - | IP54 |
Related Headphone Comparisons
More top alternatives to 7Hz Eternal:
- 7Hz Eternal vs Tin HiFi P1 Max
- 7Hz Eternal vs Shanling ME500
- Sennheiser MOMENTUM True Wireless 4 vs Etymotic ER4XR
- Sennheiser MOMENTUM True Wireless 4 vs FiiO FH7S
- Sennheiser MOMENTUM True Wireless 4 vs Muse HiFi Power
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
7Hz Eternal: $249.00 Linsoul eBay
Pros: Crinacle’s measurement gives it a preference score of 69, and squig.link measurements show bass, mids and upper mids all within about 1 dB of target, so voices and instruments sound natural. Treble rolls off gently, giving a smooth, unfatiguing sound for warm-leaning listeners. A 30 ohm, 109 dB/1kHz rating means a phone drives it easily, and each earbud weighs 6 g.
Cons: Treble above 6 kHz drops 3 to 4 dB below target with an 8.7 dB dip near 10.6 kHz, so cymbals lack sparkle and detail sounds dim. The IKKO OH10 and Etymotic ER2XR are rated higher for less money.
Full 7Hz Eternal review and specifications →
| Released | 2022 (4 years ago) |
|---|---|
| Back | Closed |
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 2.63 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 14.5mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 69 (measured by crinacle, via AutoEQ) |
| Impedance | 30 ohms |
| Sensitivity | 109 dB/1kHz |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-2.1 dB at 30 Hz) |
| Tonal Tilt | -0.36 (negative is warmer, positive brighter) |
| Weight | 0 lbs (6 g) per earbud |
EQ preset to match the Harman target
Set a preamp of -6.4 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | +1.0 dB | 0.70 |
| Peak | 184 Hz | -2.1 dB | 0.82 |
| Peak | 2,246 Hz | -3.5 dB | 2.16 |
| Peak | 812 Hz | +1.3 dB | 1.56 |
| Peak | 3,369 Hz | +2.6 dB | 3.21 |
| High shelf | 10,000 Hz | +6.4 dB | 0.70 |
| Peak | 6,115 Hz | +5.8 dB | 2.10 |
| Peak | 4,885 Hz | -8.3 dB | 4.79 |
| Peak | 8,865 Hz | +2.9 dB | 2.22 |
| Peak | 2,465 Hz | -0.4 dB | 2.69 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Sennheiser MOMENTUM True Wireless 4: $249.95 TWS Amazon eBay
Older model: the Sennheiser Momentum True Wireless 3 (ranked higher, rated 3.4/5). See every Sennheiser Momentum True Wireless generation.
Pros: This true wireless set adds active noise cancelling, Bluetooth 5.4 and a codec list that runs from SBC and AAC up to aptX Lossless and LC3. Battery life is 7.5 hours per charge and 30 hours with the case, and IP54 resistance covers sweat and light rain. Oratory1990’s measurement shows bass about 0.6 dB above target, so low end is full without being overdone.
Cons: Presence from 3 to 6 kHz is about 6.9 dB under target, with an 8.2 dB dip near 5.7 kHz, so voices and guitars sound recessed. Air above 10 kHz runs 5 dB hot with a peak of 4.2 dB near 10.6 kHz, which can add a thin, sparkly edge. The Tin HiFi P1 Max has a higher rating, for a lower price.
Full Sennheiser MOMENTUM True Wireless 4 review and specifications →
| Released | Feb 2024 (2 years ago) |
|---|---|
| Active Noise Cancelling | Yes |
| Back | Closed |
| Battery Life | 7.5 hours (30 with case, Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, aptX, aptX Adaptive, aptX Lossless, LC3 |
| Bluetooth Version | 5.4 |
| Built-in Microphone | Yes |
| Connection | True wireless |
| Deviation From Target | 2.63 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 7mm dynamic |
| Form Factor | In-ear |
| Harman Preference Score | 65 (measured by oratory1990, via AutoEQ) |
| IP Rating | IP54 |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.4 dB at 30 Hz) |
| Tonal Tilt | -0.74 (negative is warmer, positive brighter) |
| Weight | 0 lbs (6.2 g) per earbud |
EQ preset to match the Harman target
Set a preamp of -6.5 dB, then add these filters in any parametric equalizer (Wavelet, Equalizer APO, Peace, or a player with parametric EQ). Calculated by AutoEQ from its measured frequency response.
| Filter | Frequency | Gain | Q |
|---|---|---|---|
| Low shelf | 105 Hz | -0.1 dB | 0.70 |
| Peak | 5,605 Hz | +5.8 dB | 2.82 |
| Peak | 123 Hz | -2.8 dB | 0.23 |
| Peak | 3,977 Hz | +3.9 dB | 2.27 |
| Peak | 70 Hz | +2.1 dB | 0.97 |
| High shelf | 10,000 Hz | -5.2 dB | 0.70 |
| Peak | 1,511 Hz | -1.3 dB | 1.73 |
| Peak | 877 Hz | +0.8 dB | 2.46 |
| Peak | 7,841 Hz | +2.1 dB | 5.59 |
| Peak | 3,002 Hz | +0.7 dB | 3.65 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons