Criticisms of DMM Recordings
With the groove being cut straight into a metal foil, this removed a number of plating stages in the manufacturing process. This gave rise to more upper frequency levels and less surface noise. Additionally, groove pre-echo problems are significantly diminished.
DMM LP pressings are sometimes described by some as having a harshness or forwardness in the high frequencies. The fact the groove is cut to copper, a hard metal, and not to soft lacquer, nitrocelullose, supposedly endows DMM vinyl LP with a very different tonality to traditionally manufactured vinyl LP pressings. Direct Metal Mastering requires a radically different cutting angle than traditional (lacquer) cutting, almost 0 degrees. However the playback cartridges will always have the standard playback angle of 15–22.5°. Thus, the DMM process includes electronic audio processing so the records can be played with a standard cartridge despite having been cut at a substantially different angle. This electronic processing might account for the supposedly different high frequency "signature sound" of DMM records.
Read more about this topic: Direct Metal Mastering
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