Modern high-quality hands-free telecommunication systems have to cope with several real-world problems, such as corruption of the desired signal by additive noise, acoustic echoes and reverberation. This paper addresses the mutual impacts of the subsystems for acoustic echo cancellation and listening-room compensation. In acoustic systems for listening-room compensation the equalizer is placed in front of the loudspeaker. An estimate of the room impulse response is necessary for the equalizer to compensate for the influence of the room impulse response at the position of the reference microphone where the human user is located. Since the room impulse response is identified by the acoustic echo canceller anyway, its estimate can be used to design the equalizer. The quality of qualization in dependence of the degree of system identification will be investigated in this contribution. Furthermore, the influence of the equalizer on an echo canceller is analyzed.