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

[David Lewis]

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. 

Uncle Dave Lewis
uncledavelewis at hotmail.com