I once heard a demonstration of a cd player with red leds inside the drawer. When they were turned on, it stopped playing. Red light other than the laser's within the drawer can harm the sound. I tried green and black edge treatments which at the time seemed modestly effective. I have discovered, however, that recent cd cleaners, such as Audio Top and Walker Ultra Vivid, negate any benefit from the edge treatment. I guess this might because the red light from the laser is less diffracted.
Also as I now have a music server, ripping to a harddrive seems unaffected by diffraction. In short, I no longer use edge treatment although at one time I thought it had a small benefit.
Also as I now have a music server, ripping to a harddrive seems unaffected by diffraction. In short, I no longer use edge treatment although at one time I thought it had a small benefit.