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In Reply to: Speaking of Absloute Phase... posted by Ray-o-Stat on August 4, 2005 at 21:21:28:
generally, the system you are playing it on is going to be a major factor. The recording you are talking about was multi mic'd and therefore there may well be phase problems within the recording but whether it sounds better with your polarity reversed or not is probably an individual taste rather than a fact. Vinyl has notorious phase problems in the low end between channels which i feel actually sounds good in most cases.
Follow Ups:
> > > Vinyl has notorious phase problems in the low end between channels
> > > which i feel actually sounds good in most cases.Can you provide us with more information on this subject? I’m wondering why there would be phase problems in the low end between channels.
because the cutting engineer wants to sum as much as possible to mono to cut the groove deeper. Mono info takes less space and can be louder. bass will create mistracking problems so it's summed for vinyl anyway. But summing that information and the geometry problems with a stylus moving back and forth create phase anomolies between channels in vinyl playback. everyone who cuts records knows this, but then again vinyl fans perceive it has a wider soundstage. so, is it really a flaw? Viyl has more second order harmonic distortion, but again if you lik the sound...You know a fender tweed deluxe guitar amp has a huge amount of distortion compared to a modern solid state amp for guitar, but they sound a LOT better.
Summing the channels to mono does not create phase shift. If you care to measure phase using a mono test record you will see that inter-channel phase shift is caused by certain phono cartridges and begins in the higher frequencies, not the lower frequencies. Many phono cartridges exhibit negligible inter-channel phase shift across the entire audio spectrum.
i'm not being clear. Different cutting engineers with sum different frequencies into mono, including higher ones (especially int he 70's) and sometrimes this can create problems. I'll dig yup some aes papers on phase anomalies between channels in vinyl. I meant to be brief, not misleading.
The point I was making is that from a playback standpoint, there are no low frequency phase anomalies that I have ever measured using test records. If the recording people don’t know how to record phase properly, I guess that’s their problem, but I can’t see how inter-channel phase anomalies can be encoded into a mono groove. That is one thing I would really like to read about.
well, basically one problem is that information is being made mono that was stereo soi the record can be cut louder. another is cross-talk between channels. more the come.
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