Short answer: the Activo Volcano. Both are rated 3.3/5 for sound quality (#929 and #911 of 1291 in-ear headphones), and the Activo Volcano costs $79.99 against $89 for the Tangzu Fudu, with sound quality a draw, the lower price decides it.
What the Activo Volcano does well: A broadly balanced tuning with a preference score of 65 against the Harman target. The catch: Treble about 4 dB below target from 3 to 10 kHz, which can sound dull or veiled next to brighter headphones.
Why pick the Tangzu Fudu: Bass is lifted about 2.7 dB with extension to 20 Hz, giving kick drums and bass lines extra weight. Watch for: Presence sits about 3.7 dB low with a 5.9 dB dip near 5.9 kHz, so vocals and instruments lose some bite.
Buy the Activo Volcano. Both are rated the same for sound quality, and it costs $9.01 less than the Tangzu Fudu.
Still deciding? The full Headphones rankings cover every ranked option.
A broadly balanced tuning with a preference score of 65 against the Harman target.
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Bass is lifted about 2.7 dB with extension to 20 Hz, giving kick drums and bass lines extra weight.
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Specifications Side By Side
| Activo Volcano | Tangzu Fudu | |
|---|---|---|
| Price | $79.99 | $89.00 |
| Ranked | #929 of 1291 in In-Ear Headphones | #911 of 1291 in In-Ear Headphones |
| Form Factor | In-ear | In-ear |
| Back | Closed | Closed |
| Harman Preference Score | 65 (median of 3 squig.link measurements, calibrated to AutoEQ) | 65 (median of 12 squig.link measurements, calibrated to AutoEQ) |
| Deviation From Target | 3.02 dB standard deviation | 2.41 dB standard deviation |
| Tonal Tilt | -0.07 (negative is warmer, positive brighter) | -0.88 (negative is warmer, positive brighter) |
| Sub-bass Extension | Within 6 dB of target down to 20 Hz (-5.4 dB at 30 Hz) | Within 6 dB of target down to 20 Hz (+0.9 dB at 30 Hz) |
| Connection | Wired | Wired |
| Driver Type | Dynamic | Hybrid |
| Drivers | 3 dynamic drivers (1 x 8mm DD + 2 x 6mm DD) | 1 x 10mm dynamic + 2 x balanced armature |
| Impedance | 16 ohms | 16 ohms |
| Sensitivity | 100 dB/mW | - |
| Frequency Response | 20Hz - 20kHz | - |
| Weight | Lightweight PC shell | - |
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 Activo Volcano from aden, audioamigo and digaoreviews; the Tangzu Fudu from bassyalexander, csi-zone, harpo, hbb, ianfann, koi, mmagtech, rg, soundcheck39, soundignity, therollo9 and timmyv, all via squig.link.
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