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On 3/27/2015 10:15 PM, John Haley wrote:
> Paul is absolutely right about the curves.  Students will never get this
> right.  It takes a good amount of skill and experience to get the phono-EQ
> curve right.  There is no research tool that will tell you what is "right."
>   You have to use your ears, guided by experience.  There is no other way
> for instantaneous discs.  Even commercial discs sometimes involve a lot of
> trial and error.
>
> I strongly recommend getting the KAB EQS MK12, which is an excellent
> sounding preamp even apart from its curve settings, and I further recommend
> getting the small mod you can buy with it, as I did (it's an extra card
> inside), that allows you to input line level signals thru the EQ curve
> section of the electronics.  Otherwise you can only input the low levels
> from a phono cartridge through it.  That's impossible once you have
> digitized something to a wav file.  With this mod, you can do what Paul
> says, which is do flat transfers of discs and then play the resulting wav
> files thru the preamp to select the right curve, without further playing of
> the record.

It's also possible yo apply the curves uing, for example, Adobe 
Audition. A 20dB boost at 50.04Hz, for example, yields a 500.4Hz 
turnover, while you van do the treble e-emphasis with the Scientific 
Filters set to 1st order.

> Also, if you digitize the records with the wrong curve, it is really,
> really hard, maybe impossible, to reverse that to apply the right curve.
> This is because you can't reverse the turnover point electronically--it is
> not a matter of equalization (which the treble emphasis and de-emphasis
> is).  Getting the curve right often matters quite a lot in how something
> sounds.  It's not a small part of the process.
>
> Frankly, I would never trust a student with any of this.  You will destroy
> your collection and end up with garbage for transfers.

Agreed, 100%.

Peace,
Paul

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