REFERENCE RECORDINGS records and manufactures award winning, ultimate quality CDs, Hybrid SACDs, Reference Mastercuts LPs, and revolutionary HRx discs: 176.4 kHz/24 bit music on DVD audio discs. The Reference Mastercuts series of LP records is winning critical acclaim everywhere. There are over 130 releases in the RR catalog recorded by Keith O. Johnson, The chief engineer and Technical Director. He is a true audio legend, having designed and patented many innovative products in the professional and consumer fields. The RR Sound comes from his singular methods and equipment, almost all hand-built or extensively modified by him.