High-Performance Digital-Audio CD-R's! Premium, Professional Grade Digital-Audio CD-R Media are capable of record speeds from 1X to 4X (and, compatible in most computer cd recorders at 40X, too!). These are the media needed for recording on Philips, Pioneer, Harman/Kardon, JVC & Marantz (and others) brands of home CD-Recorders. Known as Digital-Audio, these are the media supported by consumer audio-only cd-to-cd home recorders. These consumer audio-only CD-R discs meet the standards of the Audio Home Recording Act (AHRA) of 1992, which requires a royalty to be paid by the disc manufacturer to the music industry. These CD-R's support the Serial Copy Management System.