• stereo and mono ready - quadraphonic system not required to enjoy the near perfect sound reproduction that shibata tipped needles offer.Shibata needles have maximum contact with the record groove, better than conical, elliptical and hyperelliptical tips.For any type of quadraphonic (4-channel) record playback, be it of the discrete (CD-4) or matrix (SQ) variety, in addition to this quality shibata stylus, the following components of a complete quad system must all be present and in working order: