Re: [ARSCLIST] Non-RIAA preamp

["Richard L. Hess" <arclists@xxxxxxxxxxxxxxx>]

At 03:30 PM 9/11/2006, Don Cox wrote:
> On 10/09/06, phillip holmes wrote:
> > In the phase encode/decode discussion of RIAA, did anyone mention that
> > speed is critical? If the disk was recorded slow or fast, you'll have
> > a hard time getting proper frequency response.
>
> Playing at the wrong speed affects pitch, but not really frequency
> response.

Hi, Don,

I think Phillip is on to something here. Since the RIAA curve (and 
many other curves) have breakpoints in them, and if it is used at the 
wrong speed, then the curve breakpoint frequencies don't align with 
the reproduced frequencies and yes, there will be some additional, 
speed-induced errors in the frequency response.

If you're going to re-pitch a recording in software, perhaps this is 
a good reason to apply the curve in software, using a flat preamp for 
the transfer. That way, the curve is applied after the pitch is 
corrected. Now, of course, do we know the precise tuning of the 
original? A=440? Maybe? Maybe not.

Cheers,

Richard


Richard L. Hess                   email: richard@xxxxxxxxxxxxxxx
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