 | SHM-CDs SHM-CD (Super High Material Compact Disc) is a high quality compact disc developed in Japan, that uses polycarbonate resin, used on LCD panels, as a coating on the CD. The sound quality is improved as it gives a more accurate laser reading of the 'pits' on the CD. |
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 | HQ - HiQuality CDs HiQuality CD uses polycarbonate plastic with greater transparency to achieve a higher quality audio. A special alloy is used as the material on the reflective layer of the CD instead of the aluminium. |
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