A listening device to be coupled to an artificial reality system, the listening device comprising: a reference microphone positioned outside a blocked ear canal of a user wearing the listening device and configured to receive environmental sounds and generate first signals based in part on the environmental sounds; a loudspeaker coupled to the reference microphone and positioned inside the ear canal of the user, the loudspeaker configured to generate internal sounds based in part on the first signals; an internal microphone positioned inside the ear canal of the user and configured to receive the internal sounds from the loudspeaker and generate second signals based in part on the internal sounds; and a controller coupled to the internal microphone, to the loudspeaker and to the reference microphone and configured to: compute a transfer function based in part on the first signals and the second signals, the transfer function describing a variation between the environmental sounds and the internal sounds caused by the listening device blocking the ear canal of the user, adjust the first signals based on the transfer function, receive artificial audio content from the artificial reality system, combine the adjusted first signals with the received artificial audio content to obtain hybrid audio content, and transmit the hybrid audio content to the loudspeaker. a reference microphone positioned outside a blocked ear canal of a user wearing the listening device and configured to receive environmental sounds and generate first signals based in part on the environmental sounds; a loudspeaker coupled to the reference microphone and positioned inside the ear canal of the user, the loudspeaker configured to generate internal sounds based in part on the first signals; an internal microphone positioned inside the ear canal of the user and configured to receive the internal sounds from the loudspeaker and generate second signals based in part on the internal sounds; and a controller coupled to the internal microphone, to the loudspeaker and to the reference microphone and configured to: compute a transfer function based in part on the first signals and the second signals, the transfer function describing a variation between the environmental sounds and the internal sounds caused by the listening device blocking the ear canal of the user, adjust the first signals based on the transfer function, receive artificial audio content from the artificial reality system, combine the adjusted first signals with the received artificial audio content to obtain hybrid audio content, and transmit the hybrid audio content to the loudspeaker. compute a transfer function based in part on the first signals and the second signals, the transfer function describing a variation between the environmental sounds and the internal sounds caused by the listening device blocking the ear canal of the user, adjust the first signals based on the transfer function, receive artificial audio content from the artificial reality system, combine the adjusted first signals with the received artificial audio content to obtain hybrid audio content, and transmit the hybrid audio content to the loudspeaker.