Its very strange. In my case they also have an tape recorder but first they asked us to listen to a test recording on CD and confirm them if we can hear that properly. If somebody in the hall have any problem they can adjust the volume. They didnt play the original CD until and unless each one of us was satisfied.
Also at the end of the test they have given us feedback form/complain form so that if we had any problem during test we can complain before leaving test room. Any complains made after leaving test room are not entertained I guess.
infra-red headphones were provided to us in India