The quietest pressings we've seen have come from QRP which is owned by Acoustic Sounds.
Its not the vinyl though- its how the pressing machines are damped so as not to shake or vibrate as the vinyl is being pressed.
In mastering different projects that went to different plants, what we've seen is that the mastering quality has more to do with the final sound than the pressing plant. For example, United has a mastering operation, which sounds rather flat and its not unusual to get some surface noise. But if a different mastering house is use and United is only used to press the LP, the results are pretty good. In all our projects we've mastered, no pressing plant so far has indicated any other options other than thickness.
Its not the vinyl though- its how the pressing machines are damped so as not to shake or vibrate as the vinyl is being pressed.
In mastering different projects that went to different plants, what we've seen is that the mastering quality has more to do with the final sound than the pressing plant. For example, United has a mastering operation, which sounds rather flat and its not unusual to get some surface noise. But if a different mastering house is use and United is only used to press the LP, the results are pretty good. In all our projects we've mastered, no pressing plant so far has indicated any other options other than thickness.