Direct comparison of sound quality between audio playback components, accomplished by frequently switching from one to another.
"Many thanks for the wonderful job that you did converting my mother's old 78 rpm album of her grandfather to CD. The results were far better than we had ever expected! Although the source material was far from an ideal medium with which to work, your resulting CD was clear and easy to listen to. Our new family CD, "Remembering Jim Hamiel," will ..."