• Some vocal sound or high frequences could be different from the master, expecially if they are listened with an high volume. This problem can be caused by a low quality playback needle. The playback needle have a rounded shape, different from the cutting stylus with a squared shape. For this reason the playback needle doesn't fit exactly in the groove, cutted with squared diamond styuls. If the playback stylus would be squared at the first listening it will re-cut the orginal groove. The rounded geometry in some condition could cause a sort of very small skip, percived by the human ear as a distorsion. The spherical stylus has a better steadiness on the groove but it has a lower wearness, reproducing with less fidelity the signinal of the groove. The eliptical stylus has less steadiness but a better reproduction of the groove signal.

In case some of the parameters here reported, we will must modify some of the sound peculiarity of the master, in order to have the best arrangement of the work.

The best compromise between quality and quantity is:
12" at 33 rpm high volume max. 12 min.
12" at 45 rpm high volume max. 10 min.
10" at 33 rpm high volume max. 8 min.
10" at 45 rpm high volume max. 6 min.