[78-L] Frequency Response/Range for 78's

[Don Cox]

Hello David

On 26/07/2012, David Lewis wrote:
> 
> Can anyone point me to a site that has a good break down of the
> realistic frequency response range for records in the 78 RPM era? I am
> looking for something that covers everything 1900-1957. I have looked
> and find bit here and there, much of it having to do how surprisingly
> well certain records from a certain era do...but I am looking for
> general guidelines. I know that all records were not made equal, so
> info on Victor records vs. Paramount is great as well. But what about
> Mexican 78's from the 1950's? Off brand 78's from the 40's? A 1938
> Vocalion vs. a 1948 Aladdin. What are some 'general' guidelines?
> 
> Thanks for any help....
>>>>> 
> Not much help here; there has been a lot of data collected on this
> front,but I do not know of a single resource for it all. Perhaps ARSC,
> or someone, should set aside a place for people to park such data:
> high peak, low peakon a label in a given year or era. There is some
> string theory type researchthat needs to be investigated in regard to
> acoustics; how some can capture backand front perspective within a
> three-dimensional environment whereas others donot, and why. Why do
> badly damaged copies of records lose this perspective? SteveSmolian
> gave a demonstration at ARSC where he demostrated room sound on a
> Carusorecording at above 20,000 hz. I couldn't hear it, but that
> doesn't mean Stevewas wrong. We would need to leave room within a
> source document collecting thesefigures to account for anomalies like
> these.
> 
There isn't a sharp cutoff at some top frequency as there
is with digital sound. The signal just gets fainter and fainter until
you can't hear it above the noise; and more sophisticated playback
equipment may find music (or room sound) at much higher frequencies than
you expect.

Likewise at low frequencies.

Regards
-- 
Don Cox
doncox at enterprise.net