Print

Print


On 4/15/2018 9:46 PM, John Haley wrote:
> Doing the phone EQ with digital de-emphasis does cause phase shifts.  To
> get it right with certainty, you need to do the phono EQ de-emphasis in the
> analog domain, which is generally done upon playback of the record, before
> digitizing.  Gary Galo gave a detailed lecture about this topic a couple of
> years ago at the ARSC convention in Pittsburgh.  Doing it analog exactly
> matches what was done when it was "encoded" (when the emphasis was added to
> the recording).
> 
> How much audible difference it makes, I think, depends somewhat on the
> source itself.  But if you do it analog, you know you have it right.

Obviously, I disagree, and my experience has borne me out; can we agree 
to disagree?

Peace,
Paul

> 
> Best,
> John
> 
> 
> 
> 
> On Sun, Apr 15, 2018 at 10:39 PM, Tim Gillett <[log in to unmask]>
> wrote:
> 
>> Hi John,
>>
>> Doesnt analog EQ, by definition,  shift phase? Or are you saying digital
>> EQ doesnt shift phase?
>>
>> 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
>>>>
>>>> ---
>>>> This email has been checked for viruses by Avast antivirus software.
>>>> https://www.avast.com/antivirus
>>>>
>>>>
>