A spec sheet is only useful once its words mean something. These pages explain the terms one at a time: what a polar pattern is and what it does to the room behind you, how a condenser differs from a dynamic in the part that actually moves, why impedance and sensitivity have to be read together before anything can be said about whether a device will drive a pair of headphones.
Each explanation is grounded in the same catalogue of published specifications the reviews use, so a definition is followed by what the figure looks like across real products rather than by an idealised example.
The aim is narrow and deliberate: after reading one of these, the corresponding line on a product page should stop being a number you skip past.
Forty-nine of the fifty-three headphone cards that name a driver type say the same word. The mechanism is settled almost everywhere, and what the card stops saying next is the interesting part.
Apple gives AirPods cancellation as "up to 4x more" than a model it never measured. No listing in this collection publishes a number for it either.
MicTested