Circumaural

They adjusted with a-dB step attenuator the loudness of one of two circumaural earphones to equality with a standard WE 705A ear-phone set at 40 dB...

First, they are usually connected by a headband and it can be difficult to place the headband or the circumaural cushion so as not to rest on a scalp...

For the first two experiments, sounds were presented through canal (insert) earphones...; for the third experiment, circumaural earphones...were employed.