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On 4/15/2018 9:39 PM, Tim Gillett wrote:
> Hi John,
> 
> Doesnt analog EQ, by definition,  shift phase? Or are you saying digital 
> EQ doesnt shift phase?

There is digital EQ available that doesn't shift phase, but you don't 
want to use it in phono de-emphasis. That phase shift (analog or 
digital) compensates for complementary phase shift when the disc is 
recorded.

Peace,
Paul

> 
> Rgds
> Tim Gillett
> 
> 
> ----- Original Message ----- From: "John Haley" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, April 16, 2018 10:28 AM
> Subject: Re: [ARSCLIST] Variable Reluctance Stereo Cartridges was "High 
> Def vinyl?"
> 
> 
>> Yes, Paul, but after resampling it to get it to the correct speed, you 
>> have
>> abandoned the analog world which is the best place to apply the 
>> phono-EQ's
>> de-emphasis without phase shifting--i.e., it is best to apply the right
>> curve during analog playback, before digitizing.
>>
>> Best,
>> John
>>
>>
>> On Sun, Apr 15, 2018 at 9:51 PM, Paul Stamler <[log in to unmask]> wrote:
>>
>>> On 4/15/2018 4:02 PM, John Haley wrote:
>>>
>>>> Mickey,
>>>>
>>>> There is a real issue with dubbing 78's (or any other recording) at a
>>>> speed
>>>> other than what it was intended to be played back at.  You are 
>>>> drastically
>>>> changing the frequencies of the recording when you play it at the wrong
>>>> speed, which will totally screw up the intended phono-EQ decoding, 
>>>> which
>>>> is
>>>> keyed into the original frequencies.
>>>>
>>>
>>> [much more good stuff snipped]
>>>
>>> If you dub the disc using a flat preamp with no EQ at 33.33 rpm, you can
>>> then resample it to an equivalent speed of 78.26, 76.6 or 80 rpm as 
>>> needed.
>>> (Audition does his well.) Once it's at the right equivalent speed, 
>>> you can
>>> add de-emphasis at the appropriate frequencies. This offers, for 
>>> example, a
>>> way to get the good tracking of a Grado 78 cartridge, while 
>>> minimizing the
>>> infamous "Grado wobble" -- there will be fewer things to excite it at 
>>> 33.33
>>> rpm than at 78 rpm (or a similarly high speed).
>>>
>>> Peace,
>>> Paul
>>>
>>> ---
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>