Two forms: One is caused by pressing issues, those are alway exactly one revolution of the LP befor the loud music starts.
The other is a master tape print through, and can be any varied length of time in seconds before the loud music starts.
So usally it is only noticable when a very quiet passage, (or the blank space before a passage starts) before a loud passage.
And it is natural in any resolving Lp playback system.
(I used to believe it was always a master tape print through, but have learned it is also from pressing/disc cutting issues)
The other is a master tape print through, and can be any varied length of time in seconds before the loud music starts.
So usally it is only noticable when a very quiet passage, (or the blank space before a passage starts) before a loud passage.
And it is natural in any resolving Lp playback system.
(I used to believe it was always a master tape print through, but have learned it is also from pressing/disc cutting issues)

