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What about bringing the two channels together for mono?  No doubt it  
was recorded in mono...

<L>

Lou Judson  Intuitive Audio
415-883-2689


On May 14, 2009, at 9:38 AM, Malcolm Rockwell wrote:

> Odd that this phasing observation should arise now.
> I have been transferring some mono 1930s ARC test pressings in  
> stereo and noticed that the two signals were seemingly out of  
> phase. I initially thought it might be an incorrectly wired cart,  
> but that turned out not to be the case. Next I looked at the record  
> groove - normal. Then I looked at the signals on the computer  
> again. The run-in to the musical content IS out of phase (that's  
> where all the rumble shows up), but the musical signal itself is in  
> phase!
> Shelving at around 80 Hz and notching at both 60 and 120 Hz should  
> do the trick without adversely affecting the program content. I'm  
> going to try that.
> Mal
>
> *******