I took the helmet because it has an optical input and my TV can not send sound on the jack and speakers all the time, while the optical output and pregnant at the same time he can. Note that I am hearing impaired, the optical output was therefore the only alternative to watch TV without disturbing anyone and without depriving other sound ... I am satisfied with the operation, just under the volume that is a little low even my wife who has no hearing problems find it a bit low. She said against it by an impeccable sound quality. I unfortunately do not know because I am a victim of accouphène. For now I just have to watch TV at a reasonable volume. (About 40% of hearing loss)