The KLH Ultimate One ranks #147 out of 165 total Over-Ear Headphones for sound quality. See all Headphones rankings for every top pick.
Brand: KLH
Prices on this page were last checked October 10, 2026 at 5:37 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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#147 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.
| 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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