Short answer: a tie on sound quality. Both are rated 4.3/5 (#131 and #147 of 450 in-ear headphones) at nearly the same price ($20.99 vs $22.99), so choose on features and fit.
Why pick the Moondrop Chu 2: A preference score of 77 in HypetheSonics’ measurement, with bass about 2.1 dB above target from 60 to 200 Hz and sub-bass reaching 20 Hz, giving a warm, full sound that suits bass lovers. Watch for: A 5.7 dB dip near 6.6 kHz and treble about 1.6 dB below target from 6 to 10 kHz soften cymbal attack, while a 4.7 dB peak near 8.8 kHz can make some sibilants stand out.
Buy the CCA Duo or the Moondrop Chu 2 on features: they are rated the same for sound quality at close to the same price.
Looking for alternatives? See the complete Headphones rankings.
Specifications Side By Side
| CCA Duo | Moondrop Chu 2 | |
|---|---|---|
| Price | $20.99 | $22.99 |
| Ranked | #131 of 450 in In-Ear Headphones | #147 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 (measured by HypetheSonics, via AutoEQ) |
| Deviation From Target | 1.61 dB standard deviation | 1.79 dB standard deviation |
| Tonal Tilt | +0.49 (negative is warmer, positive brighter) | -0.50 (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 (+0.6 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 2 x 7mm dynamic | 1 x 10mm dynamic |
| Impedance | 18 ohms | 18 ohms |
| Sensitivity | 106 dB/mW | 119 dB/Vrms |
| Frequency Response | 20Hz - 40kHz (Manufacturer specified) | 20Hz - 20kHz (Manufacturer specified) |
| Built-in Microphone | No | No |
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More top alternatives to CCA Duo:
- CCA Duo vs TRN Dolphin
- CCA Duo vs CCA Lyra
- Moondrop Chu 2 vs TRN Dolphin
- CCA Lyra vs Moondrop Chu 2
- Moondrop Chu 2 vs TForce Yuanli
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
Moondrop Chu 2: $22.99 Linsoul eBay
Pros: A preference score of 77 in HypetheSonics’ measurement, with bass about 2.1 dB above target from 60 to 200 Hz and sub-bass reaching 20 Hz, giving a warm, full sound that suits bass lovers. At 119 dB/Vrms and 18 ohms it gets loud from any phone dongle. It rates slightly above the Moondrop Quarks and the KZ ZSN Pro X, both similarly cheap.
Cons: A 5.7 dB dip near 6.6 kHz and treble about 1.6 dB below target from 6 to 10 kHz soften cymbal attack, while a 4.7 dB peak near 8.8 kHz can make some sibilants stand out. There is no built-in microphone for calls.
Full Moondrop Chu 2 review and specifications →
| Released | 2023 (3 years ago) |
|---|---|
| Back | Closed |
| Built-in Microphone | No |
| Connection | Wired |
| Deviation From Target | 1.79 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 (measured by HypetheSonics, via AutoEQ) |
| Impedance | 18 ohms |
| Sensitivity | 119 dB/Vrms |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (+0.6 dB at 30 Hz) |
| Tonal Tilt | -0.50 (negative is warmer, positive brighter) |
EQ preset to match the Harman target
Set a preamp of -5.2 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 | -1.0 dB | 0.70 |
| Peak | 6,256 Hz | +5.6 dB | 2.08 |
| Peak | 173 Hz | -2.2 dB | 1.20 |
| Peak | 688 Hz | +1.8 dB | 1.36 |
| Peak | 3,259 Hz | -2.5 dB | 1.67 |
| High shelf | 10,000 Hz | -2.3 dB | 0.70 |
| Peak | 68 Hz | +0.6 dB | 1.76 |
| Peak | 114 Hz | -0.4 dB | 2.53 |
| Peak | 1,379 Hz | -0.2 dB | 2.48 |
| Peak | 8,425 Hz | +1.2 dB | 5.63 |
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons