David,
The slow rotation test is excellent for detecting pressing voids and sporadic vinyl damage at dynamic peaks due to mistracking cartridges. Those produce sharper-edged shapes in the vinyl than any musical waveform, they're faster than the fastest transient cut by a cutting head. Even at slow rpm's, where musical information all sounds fairly low pitched, flaws and damage like that sound sharp and crisp.
I haven't tried it on a record with general background noise or grunge, so I'm not sure how that would sound. Probably results would vary depending on the shape of the grunge?
Doug
The slow rotation test is excellent for detecting pressing voids and sporadic vinyl damage at dynamic peaks due to mistracking cartridges. Those produce sharper-edged shapes in the vinyl than any musical waveform, they're faster than the fastest transient cut by a cutting head. Even at slow rpm's, where musical information all sounds fairly low pitched, flaws and damage like that sound sharp and crisp.
I haven't tried it on a record with general background noise or grunge, so I'm not sure how that would sound. Probably results would vary depending on the shape of the grunge?
Doug