OK, I just googled it, and it appears to be a misunderstanding of 180 gram vinyl--LOL. In general, the thickness of the vinyl will have little effect on sound, though the audiophile companies (which usually make the better reissues, IMHO) tend to use 180 and 200 gram vinyl. The problem with using that as a benchmark is that a lot of non-audiophile companies, who use CDs as masters, also tout their use of heavy vinyl (one common hype sticker, used by the very worst companies, says something like "180 gram--good enough for audiophiles!"). For most new music releases, you usually won't have any choices, and have to hope that the record is mastered and manufactured with care. For reissues of popular older albums, on the other hand, you may be inundated with choices. Unfortunately, in my experience, the better choices for the latter tend to be the more expensive ones, coming from companies that use mainly analog sources and cutting (such as MFSL, Analogue Productions, ORG Music, and Speakers Corner). The phrase "all analog chain," as well as a named mastering engineer, should be more significant than the thickness of the vinyl. As always, though, there are exceptions, and YMMV, and all that.

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