Short answer: the Sennheiser Momentum 4 Wireless, though neither ranks well in its class. Both are rated 2.5/5 for sound quality (#202 and #197 of 216 over-ear headphones), and the Sennheiser Momentum 4 Wireless costs $227.38 against $325.11 for the KLH Ultimate One, so with nothing between them on sound quality, price settles it. Both are rated below 3.0/5 among the 216 over-ear headphones, and the HIFIMAN Ananda Nano, ranked #4 at $319, is a better place to start if sound quality matters.
Why pick the KLH Ultimate One: Bass from 60 to 200 Hz runs about 8.5 dB above target with sub-bass 5 dB up, so bass lovers get heavy, rumbling lows from an open headphone. The tradeoff: In oratory1990’s measurement the treble also sits about 5 dB above target from 3 to 16 kHz with a 9.6 dB peak near 6 kHz, which can make vocals and cymbals sound sharp and tiring at volume.
The case for the Sennheiser Momentum 4 Wireless: Feature set is strong: active noise cancelling, Bluetooth 5.2 with SBC, AAC, aptX and aptX Adaptive, and a rated 60 hours of battery. The catch: That bass boost overshoots the Harman target by a clear margin and adds about 2 dB in the low mids, which can make vocals and bass guitar thick.
Buy the Sennheiser Momentum 4 Wireless. Both are rated the same for sound quality, and it costs $97.73 less than the KLH Ultimate One.
Still deciding? The full Headphones rankings cover every ranked option.
Specifications Side By Side
| KLH Ultimate One | Sennheiser Momentum 4 Wireless | |
|---|---|---|
| Price | $325.11 | $227.38 |
| Ranked | #197 of 216 in Over-Ear Headphones | #202 of 216 in Over-Ear Headphones |
| Form Factor | Over-ear | Over-ear |
| Harman Preference Score | 49 (measured by oratory1990, via AutoEQ) | 47 (measured by oratory1990, via AutoEQ) |
| Deviation From Target | 3.96 dB standard deviation | 3.31 dB standard deviation |
| Tonal Tilt | -1.03 (negative is warmer, positive brighter) | -1.68 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+2.6 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+8.2 dB at 30 Hz) |
| Connection | Wired | Wireless and wired |
| Back | Open | Closed |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 50mm dynamic | 1 x 42mm dynamic |
| Impedance | 32 ohms | - |
| Sensitivity | 97 dB/mW | 106 dB SPL (1 kHz / 0 dB FS) |
| Weight | 0.7 lbs (340 g) | 0.6 lbs (293 g) |
| Frequency Response | 18Hz - 22kHz (Manufacturer specified) | 6Hz - 22kHz (Manufacturer specified) |
| Built-in Microphone | No | Yes |
| Active Noise Cancelling | - | Yes |
| Battery Life | - | 60 hours (Manufacturer specified) |
| Bluetooth Version | - | 5.2 |
| Bluetooth Codecs | - | SBC, AAC, aptX, aptX Adaptive |
| IP Rating | - | None |
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- Sennheiser Momentum 4 Wireless vs Audio-Technica ATH-A990Z
- Audio-Technica ATH-AD900X vs Sennheiser Momentum 4 Wireless
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
KLH Ultimate One: $325.11 Amazon eBay
Pros: Bass from 60 to 200 Hz runs about 8.5 dB above target with sub-bass 5 dB up, so bass lovers get heavy, rumbling lows from an open headphone. At 32 ohms and 97 dB/mW it plays at moderate volume from a phone or laptop without an amp, and it rates level with the Audio-Technica ATH-AD900X and AKG K271 MKII.
Cons: In oratory1990’s measurement the treble also sits about 5 dB above target from 3 to 16 kHz with a 9.6 dB peak near 6 kHz, which can make vocals and cymbals sound sharp and tiring at volume. A deviation of nearly 4 dB and a preference score of 49 mean most listeners will hear a heavily colored sound, and the open back leaks noise both ways. The Neumann NDH20 rates slightly higher.
Full KLH Ultimate One review and specifications →
| Released | 2020 (6 years ago) |
|---|---|
| Back | Open |
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 3.96 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 50mm dynamic |
| Form Factor | Over-ear |
| Frequency Response | 18Hz - 22kHz (Manufacturer specified) |
| Harman Preference Score | 49 (measured by oratory1990, via AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 97 dB/mW |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+2.6 dB at 30 Hz) |
| Tonal Tilt | -1.03 (negative is warmer, positive brighter) |
| Weight | 0.7 lbs (340 g) |
EQ preset to match the Harman target
Set a preamp of -6.1 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 | +0.6 dB | 0.70 |
| Peak | 1,122 Hz | +6.6 dB | 0.74 |
| Peak | 206 Hz | -7.1 dB | 0.57 |
| Peak | 478 Hz | +3.3 dB | 1.24 |
| Peak | 2,632 Hz | -5.8 dB | 2.57 |
| High shelf | 10,000 Hz | -3.4 dB | 0.70 |
| Peak | 6,143 Hz | -4.3 dB | 6.00 |
| Peak | 4,905 Hz | +2.7 dB | 2.64 |
| Peak | 43 Hz | -0.6 dB | 2.14 |
| Peak | 5,841 Hz | -1.7 dB | 6.00 |
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Sennheiser Momentum 4 Wireless: $227.38 Wireless Amazon eBay
Pros: Feature set is strong: active noise cancelling, Bluetooth 5.2 with SBC, AAC, aptX and aptX Adaptive, and a rated 60 hours of battery. It also plays wired and has a built-in microphone. The deep bass lift, about 9 dB in the sub-bass and 6 dB in the bass, suits listeners who like a warm, bass-heavy sound.
Cons: That bass boost overshoots the Harman target by a clear margin and adds about 2 dB in the low mids, which can make vocals and bass guitar thick. A 4.7 dB dip near 2.4 kHz followed by a 3.5 dB peak near 6.8 kHz makes the upper midrange uneven. Its preference score of 47 trails the Beats Studio3 Wireless, which is rated higher.
Full Sennheiser Momentum 4 Wireless review and specifications →
| Released | Aug 2022 (4 years ago) |
|---|---|
| Active Noise Cancelling | Yes |
| Back | Closed |
| Battery Life | 60 hours (Manufacturer specified) |
| Bluetooth Codecs | SBC, AAC, aptX, aptX Adaptive |
| Bluetooth Version | 5.2 |
| Built-in Microphone | Yes |
| Connection | Wireless and wired |
| Deviation From Target | 3.31 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 42mm dynamic |
| Form Factor | Over-ear |
| Frequency Response | 6Hz - 22kHz (Manufacturer specified) |
| Harman Preference Score | 47 (measured by oratory1990, via AutoEQ) |
| IP Rating | None |
| Sensitivity | 106 dB SPL (1 kHz / 0 dB FS) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+8.2 dB at 30 Hz) |
| Tonal Tilt | -1.68 (negative is warmer, positive brighter) |
| Weight | 0.6 lbs (293 g) |
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 | -7.4 dB | 0.70 |
| Peak | 195 Hz | -3.6 dB | 1.22 |
| Peak | 2,393 Hz | +6.1 dB | 1.81 |
| Peak | 1,726 Hz | +1.6 dB | 1.71 |
| Peak | 2,893 Hz | -3.2 dB | 5.94 |
| High shelf | 10,000 Hz | +0.5 dB | 0.70 |
| Peak | 63 Hz | +1.7 dB | 2.86 |
| Peak | 652 Hz | +1.2 dB | 2.25 |
| Peak | 952 Hz | -1.0 dB | 3.69 |
| Peak | 316 Hz | -0.9 dB | 3.46 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons