iKKO
OH2 Opal
headphones
$79
Used market: $60*
Specifications
3 of 6 values have a recorded sourceExpert Audio Engineering Commentary
Tonal Profile
A single dynamic with a deposited carbon-nanotube diaphragm and MMCX sockets. At 100 dB/mW and 32 Ω — about 115 dB/V — it is the least sensitive of the mainstream in-ears here, which mostly means the volume dial sits in a usable place.
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.
Unit not stated
«Sensitivity: 100dB»
The OH2 page drops the unit that the same manufacturer's OH10 page carries — «106dB/mW» there, plain «100dB» here, in the same «Product Specifications» block with the same field names. At the stated 32 Ω the two readings differ by 15 dB.
checked 8/5/2026* Estimated with the depreciation fallback (~76% retained value). · checked on 8/5/2026