Short answer: the Tanchjim x Effect Audio Force. Both are rated 4.2/5 for sound quality (#209 and #181 of 450 in-ear headphones), and the Tanchjim x Effect Audio Force costs $279.99 against $309.99 for the Binary EP321, so with nothing between them on sound quality, price settles it.
Buy the Tanchjim x Effect Audio Force. Both are rated the same for sound quality, and it costs $30 less than the Binary EP321.
Looking for alternatives? See the complete Headphones rankings.
Specifications Side By Side
| Binary EP321 | Tanchjim x Effect Audio Force | |
|---|---|---|
| Price | $309.99 | $279.99 |
| Ranked | #181 of 450 in In-Ear Headphones | #209 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 77 (median of 3 squig.link measurements, calibrated to AutoEQ) | 76 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.61 dB standard deviation | 1.95 dB standard deviation |
| Tonal Tilt | -0.46 (negative is warmer, positive brighter) | +0.10 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.7 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-3.9 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Hybrid (1 dynamic + 1 passive radiator + 3 balanced armature + 1 MEMS) | Dynamic |
| Drivers | 1 x 10mm dynamic + 1 x 6mm passive radiator + 3 x balanced armature + 1 x MEMS | 1 x 10mm dynamic + 1 x 8.2mm dynamic |
| Impedance | 13 ohms | 17 ohms |
| Sensitivity | 122 dB SPL/V | 120 dB/Vrms |
| Weight | 0 lbs (7.5 g) | - |
| Frequency Response | 8Hz - 40kHz (Manufacturer specified) | 8Hz - 48kHz (Manufacturer specified) |
| Built-in Microphone | No | No |
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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
Binary EP321: $309.99 Amazon eBay
Full Binary EP321 review and specifications →
| Released | Feb 2026 (8 months ago) |
|---|---|
| Back | Closed |
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 1.61 dB standard deviation |
| Driver Type | Hybrid (1 dynamic + 1 passive radiator + 3 balanced armature + 1 MEMS) |
| Drivers | 1 x 10mm dynamic + 1 x 6mm passive radiator + 3 x balanced armature + 1 x MEMS |
| Form Factor | In-ear |
| Frequency Response | 8Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 77 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 13 ohms |
| Sensitivity | 122 dB SPL/V |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-0.7 dB at 30 Hz) |
| Tonal Tilt | -0.46 (negative is warmer, positive brighter) |
| Weight | 0 lbs (7.5 g) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
Tanchjim x Effect Audio Force: $279.99 Amazon eBay
Full Tanchjim x Effect Audio Force review and specifications →
| Back | Closed |
|---|---|
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 1.95 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic + 1 x 8.2mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 8Hz - 48kHz (Manufacturer specified) |
| Harman Preference Score | 76 (median of 3 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 17 ohms |
| Sensitivity | 120 dB/Vrms |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.9 dB at 30 Hz) |
| Tonal Tilt | +0.10 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons