Dough Pomeroy:

>You are not the only responder to
>have stated that a mono mix should
>be made before de-clicking and other
>noise removal work is done. I have
>heard this view stated in the past, but
> I can't agree.

And now for the ultimate way to recover the most from any lateral cut mono disk record:

http://ortofon.com/hifi/products/cartridges/2m-series/2m-mono-se

"Why should you use a dedicated mono cartridge for playing vinyl mono records?

On a mono record the signal is cut only in the lateral dimension whereas a stereo record is cut at +/- 45 degrees into the opposing groove-walls, see figure to the right.

A stereo cartridge will be able to replay stereo and mono records, because mono is a special version of stereo where the right and left channels are identical.

While a stereo cartridge can play mono records it can’t achieve the same signal precision between the two channels. A mono cartridge produces but one signal that is directed to both channels in the system. A mono cartridge playing a mono record produces a more forceful and stable image with a fuller, more impactful sound.

Another big advantage in using a mono cartridge to play mono records is the absence of response to vertical movement. This means that a mono cartridge is basically immune to the pinching effect which comes into action when the stylus is pushed vertically upward in very narrow grooves. Also the response to dust, dirt and wear is reduced substantially. The final result will be a clean and noiseless reproduction of the mono record.

The listening experience will be significantly improved when using a high quality true mono cartridge for the replay of your mono records."

End Quote Ortofon.

1/ Complete removal of the pinch distortion that can reach up to 30 % second harmonic when played by a stereo cartridge.

2/ Free removal of dust dirt ticks and scratches and audible distortion caused by wear.

3/ Up to 20 dB less rumble by using an only horisontal sensing replay device that excludes the vertical component where all the rumble hides..

Makes the uses of digital click/crackle/hiss removal tools much more effective.

So ditch all your stereo catridges and play the disks as they were meant to be played !!!

:-)


>I find the best contemporary digital
>de-clickers are so good that they
>fully remove the distortions caused
>by scratches. Once these and other
> defects are replaced by sound
>synthesized from surrounding audio,
> they effectively vanish and do not
>depend on mixing for removal.

By using a true lateral responding device only then the digital noise removal tools work much faster since there is less to do.

>As you have mentioned, the stereo
>transfer of a lateral recording allows
>distorted areas on only one groove
>wall to be manually replaced by a
>less distorted section from the
> corresponding section from the
>opposite wall, and this is indeed a
> powerful tool.

And you have lost 3 dB S/N that is free when using a lateral responding device only.

>A mono mix prior to de-clicking just
>combines the non-vertical noise from
>both channels. I find processing the
> stereo before making the mono to
> be a superior approach, but I understand
>there are those who disagree.

Thus the noise increases 3 dB because it is not correlated ie is not in phase between L/R.

The audio signal, is identical on the left or right track thus when combined increases by +6dB thus we always gain +3 dB net by using a lateral responding device which we get by summing L+R.

It´s free. to do.

But then the very best to get the most out of any lateral recorded disk is a lateral responding, mono only, cartridge as stated by Ortofon.

Because then we remove all the imperfections in using a stereo cartridge trying to extract the audio from lateral cut disks.

The EMT OFD65 with a truncated elliptical is very good for 78´s.

And it is a lateral responding only device too.


--
Best regards,

Goran Finnberg
The Mastering Room AB
Goteborg
Sweden

E-mail: [log in to unmask]

Learn from the mistakes of others, you can never live long enough to
make them all yourself. - John Luther

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