Short answer: a tie on sound quality. Both are rated 4.3/5 (#131 and #158 of 450 in-ear headphones) at nearly the same price ($20.99 vs $20.99), so choose on features and fit.
Buy the CCA Duo or the TRN Dolphin on features: they are rated the same for sound quality at close to the same price.
Want more options? Browse the full Headphones rankings.
Specifications Side By Side
| CCA Duo | TRN Dolphin | |
|---|---|---|
| Price | $20.99 | $20.99 |
| Ranked | #131 of 450 in In-Ear Headphones | #158 of 450 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 78 (median of 12 squig.link measurements, calibrated to AutoEQ) | 77 (median of 8 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.61 dB standard deviation | 1.72 dB standard deviation |
| Tonal Tilt | +0.49 (negative is warmer, positive brighter) | +0.14 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.6 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+0.4 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 2 x 7mm dynamic | 1 x 10mm dynamic |
| Impedance | 18 ohms | 32 ohms |
| Sensitivity | 106 dB/mW | 106 dB |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 20Hz - 20kHz (Manufacturer specified) |
| Built-in Microphone | No | - |
Related Headphone Comparisons
How CCA Duo compares with other leading options:
- CCA Duo vs Moondrop Chu 2
- CCA Duo vs CCA Lyra
- CCA Lyra vs TRN Dolphin
- Moondrop Chu 2 vs TRN Dolphin
- Kiwi Ears Cadenza vs Kiwi Ears Cadenza II
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
CCA Duo: $20.99 Amazon eBay
Full CCA Duo review and specifications →
| Released | Jul 2023 (3 years ago) |
|---|---|
| Back | Closed |
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 1.61 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 2 x 7mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) |
| Harman Preference Score | 78 (median of 12 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 18 ohms |
| Sensitivity | 106 dB/mW |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-3.6 dB at 30 Hz) |
| Tonal Tilt | +0.49 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons
TRN Dolphin: $20.99 Amazon eBay
Full TRN Dolphin review and specifications →
| Released | Mar 2026 (7 months ago) |
|---|---|
| Back | Closed |
| Connection | Wired |
| Deviation From Target | 1.72 dB standard deviation |
| Driver Type | Dynamic |
| Drivers | 1 x 10mm dynamic |
| Form Factor | In-ear |
| Frequency Response | 20Hz - 20kHz (Manufacturer specified) |
| Harman Preference Score | 77 (median of 8 squig.link measurements, calibrated to AutoEQ) |
| Impedance | 32 ohms |
| Sensitivity | 106 dB |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.4 dB at 30 Hz) |
| Tonal Tilt | +0.14 (negative is warmer, positive brighter) |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons