Short answer: a tie on sound quality. Both are rated 4.8/5 (#26 and #28 of 1291 in-ear headphones) at nearly the same price ($22.99 vs $23.99), so choose on features and fit.
Why pick the 7Hz Salnotes Zero: A Harman score of 84 from a single 10 mm dynamic driver at a bargain price is remarkable. The catch: Presence and treble run about 2.1 to 2.2 dB under target, and a 6.2 dB dip near 10 kHz leaves cymbals and breath detail muted.
What the CCA Trio does well: In squig.link measurements, the median of eight hobbyist samples, it scores 84 for preference, impressive for a very cheap in-ear. The catch: A 5.3 dB peak near 8.4 kHz and air about 2.6 dB above target can make sibilants and cymbals sound sharp on bright tracks.
Buy the 7Hz Salnotes Zero or the CCA Trio on features: they are rated the same for sound quality at close to the same price.
Want more options? Browse the full Headphones rankings.
A Harman score of 84 from a single 10 mm dynamic driver at a bargain price is remarkable.
Amazon $22.99 eBay
In squig.link measurements, the median of eight hobbyist samples, it scores 84 for preference, impressive for a very cheap in-ear.
Amazon $23.99 eBayPrices on this page were last checked October 16, 2026 at 5:46 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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Specifications Side By Side
| 7Hz Salnotes Zero | CCA Trio | |
|---|---|---|
| Price | $22.99 | $23.99 |
| Ranked | #26 of 1291 in In-Ear Headphones | #28 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Harman Preference Score | 84 (measured by oratory1990, via AutoEQ) | 84 (median of 8 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 1.31 dB standard deviation | 1.15 dB standard deviation |
| Tonal Tilt | -0.16 (negative is warmer, positive brighter) | -0.12 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-1.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (-0.3 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Dynamic |
| Drivers | 1 x 10mm dynamic | 3 x 8mm dynamic |
| Impedance | 32 ohms | - |
| Sensitivity | 108 dB SPL/V | 101-103 dB |
| Frequency Response | 10Hz - 20kHz (Manufacturer specified) | 20Hz - 40kHz (Manufacturer specified) |
| Back | Closed | Closed |
| Weight | - | 0 lbs (10 g) per earbud |
Frequency Response Compared
Both headphones’ measurements overlaid on the Harman target. Above the target sounds louder in that range, below it quieter. Each curve is the median of several independent measurements, shifted so its 500 Hz to 2 kHz average sits at 0 dB, so only the tuning is compared.
Measurement data: the 7Hz Salnotes Zero from achoreviews, aftersound, ankramutt, arn, audioamigo, bassaudio, bedrock, cammyfi, dentreviews, dvewlsh, eplv, flare, gadgetrytech, harpo, harutohiroki, hbb, hobbytalk, ianfann, iemocean, iemworld, jaytiss, lown-fi, lumerion, mmagtech, musicafe, nymz, precog, pw, sl0the, soundcheck39, superreview, tedthepraimortis, theaudiostore, therollo9, timmyv, treblewellxtended, vortexreviews and yoshiultra; the CCA Trio from jaytiss, lown-fi, melatonin, obodio, practiphile, pw, therollo9 and tonedeafmonk, all via squig.link.
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