Short answer: the HiBy Project Ace. It ranks #253 of 450 in-ear headphones by sound quality, rated 4.0/5, at $219; the 7Hz Timeless II ranks #288, rated 3.9/5, at $217.55. With prices this close, go by the sound-quality ranking rather than the cost.
Buy the HiBy Project Ace. It is rated higher for sound quality, and the $1.45 you would save on the 7Hz Timeless II does not close the gap.
Still deciding? The full Headphones rankings cover every ranked option.
Specifications Side By Side
| HiBy Project Ace | 7Hz Timeless II | |
|---|---|---|
| Price | $219.00 | $217.55 |
| Ranked | #253 of 450 in In-Ear Headphones | #288 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 74 (median of 4 squig.link measurements, calibrated to AutoEQ) | 73 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 2.07 dB standard deviation | 1.89 dB standard deviation |
| Tonal Tilt | +0.15 (negative is warmer, positive brighter) | -0.56 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.5 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+1.1 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Planar magnetic |
| Drivers | 1 x 12mm dynamic | 1 x 14.5mm planar magnetic |
| Impedance | 32 ohms | 15.2 ohms |
| Sensitivity | 115 dB | 108 dB/V |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) | 20Hz - 20kHz (Manufacturer specified) |
| Weight | 0 lbs (8.3 g) | 0 lbs (5 g) per earbud |
| Built-in Microphone | - | No |
Related Headphone Comparisons
How HiBy Project Ace compares with other leading options:
- HiBy Project Ace vs TRN Azure Dragon
- Edifier Stax Spirit S10 vs HiBy Project Ace
- 7Hz Timeless II vs Tin HiFi P1 Max
- 7Hz Timeless II vs ZiiGaat Arete
- 7Hz Timeless II vs Fearless Audio Shangri-la
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
HiBy Project Ace: $219.00 Amazon eBay
Full HiBy Project Ace review and specifications →
| Released | 2024 (2 years ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 2.07 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 12mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 74 (median of 4 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 115 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.5 dB at 30 Hz) |
| Tonal Tilt | +0.15 (negative is warmer, positive brighter) |
| Weight | 0 lbs (8.3 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
7Hz Timeless II: $217.55 Amazon eBay
Full 7Hz Timeless II review and specifications →
| Released | Nov 2024 (1 year ago) |
|---|---|
| Back | Closed |
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 1.89 dB standard deviation |
| Driver Type | Planar magnetic |
| Drivers | 1 x 14.5mm planar magnetic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 73 (median of 7 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 15.2 ohms |
| Sensitivity | 108 dB/V |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+1.1 dB at 30 Hz) |
| Tonal Tilt | -0.56 (negative is warmer, positive brighter) |
| Weight | 0 lbs (5 g) per earbud |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons