Test LP group buy

The extra noise will confuse the PLL in the W&F meter. ... I have seen service shops put a box on a turntable they were testing to generate drag from windage.

Dynamic drag. Interesting to see what happens when the load noise keys on or off.

3150Hz mono, then the load noise in one or both channels, and perhaps with a wide notch around 3150Hz. So you have two ways for separating the speed signal from the noise prior to analysis.
 
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re-read some older hifi magazines, with some folks from the pressing plants quoted that "180gram is a waste of resource, no advantage there. In fact, warpage as as bad for 180gram than for pretty much any other weight. For sound quality, no difference" was noted.
Different story for 45rpm though - this was considered "significantly better (not surprisingly), if good quality vinyl was used. "Coarse" grains of vinyl have a tendency to increase background noise."

So, if there is no difference, we might just as well go with 180gram, mechanical stability is a little higher..... thoughts?
 
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Another thought is that we should be able to make a certain level of accuracy a condition of the deal with the pressing plant. In looking around it's clear that are a lot of complaints about poor pressings in recent production and off centered lps one of the issues. It might be good pr for a plant to step up to the challenge. It's not like they have no competition.