C12
headphones
$47
Used market: $35*
Specifications
3 of 6 values have a recorded sourceExpert Audio Engineering Commentary
Tonal Profile
One dynamic woofer with five balanced armatures per side at under fifty dollars — the driver count is the selling point and also the reason the impedance curve is anything but flat. Twelve drivers per pair, hence the name.
Gain Staging Advice
With six drivers behind a passive crossover at 24 Ω, source output impedance is the variable that decides how this sounds. A phone jack at under 1 Ω and a laptop jack at 30 Ω are not the same earphone.
What the datasheet actually says
Quoted verbatim from the manufacturer’s own page, with the date we checked it. We state what is printed, not what anyone intended by it.
«Sensitivity 112dB»
No reference is given, and 112 dB is high enough that both readings look plausible on paper: at 24 Ω it is either about 112 dB/mW (≈128 dB/V) or 112 dB/V (≈96 dB/mW) — a 16 dB spread between «drives off anything» and «wants a real source». The same table gives the frequency range as «7-40000Hz», a span no in-ear transducer is measured over in any standard way, which is a fair warning about how precisely the rest of the row is meant.
checked 8/5/2026* Estimated with the depreciation fallback (~74% retained value). · checked on 8/5/2026