radiation resistance: In relation to loudspeakers, the radiation resistance indicates how efficiently it can convert the electrical energy supplied to it into sound: This fact is analogous to electrical Resistance and its ability to convert or radiate electrical energy into heat. For the working range of a loudspeaker, the radiation resistance increases with increasing frequency.
In addition:
The larger the membrane area, the greater the radiation resistance.
The phenomenon of radiation resistance is also interesting because it can be used to clarify an observation that is often misinterpreted in practice: the draft that is felt in front of an active bass membrane is not a sign that the listener is receiving proper “bass pressure”, but rather an expression of the blind component.