DZ4
headphones
$39
Used market: $30*
Specifications
3 of 6 values have a recorded sourceExpert Audio Engineering Commentary
Tonal Profile
Three 6 mm titanium-dome dynamics plus a 6 mm passive radiator per side — an unusual topology at this price, and the reason the impedance is only 12 Ω: the drivers are wired in parallel.
Amplification Warning
12 Ω is low enough that source output impedance matters twice over: a 10 Ω laptop jack forms a divider that throws away nearly half the voltage, and the current demand rises with it.
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：104dB»
No unit is given. At the stated 12 Ω the two readings are 19.2 dB apart — 104 dB/mW is roughly 123 dB/V. We record milliwatts because Letshuoer prints «dB/mW» where it prints a unit at all, and because 104 dB/V at 12 Ω would describe an earphone no portable source could drive to normal listening levels, which is not what this one is.
checked 8/5/2026* Estimated with the depreciation fallback (~77% retained value). · checked on 8/5/2026