Re: arsclist Diamond Disc Frequency response

[Graham Newton <gn@xxxxxxxxxxxxxxxxxxxxx>]

Dave Meyers  Overkill audio inc.
audio101@xxxxxxxxxxxxxx wrote:

> Has anybody observed what the upper and lower frequency limits of Edison
> Diamond Discs would be?
> IE: Beyond what high/low frequency would there be little if any
> significant recoverable information?

It varies slightly with the specific recording since Edison was not a model 
of consistancy.  Some discs are recorded much louder than others and some 
have a decided muffled character, where others have much better clarity and 
frequency response.  Most of this can be probably be attributed to the 
adjustmant of the specific recording head in use on the day of the recording.

With all that said, generally, looking at a few of the discs played flat 
through a spectrum display, and using CEDAR's DEQ to set up a 30th order 
variable hi-pass and low-pass filter, there appears to be virtually no 
program content recoverable outside of 160 Hz at the low end and 4.5 kHz 
at the high end. 



... Graham Newton

-- 
Audio Restoration by Graham Newton, http://www.audio-restoration.com
World class professional services applied to phonograph and tape
recordings for consumers and re-releases, featuring CEDAR processes.
-
For subscription instructions, see the ARSC home page
http://www.arsc-audio.org/arsclist.html
Copyright of individual posting is owned by the author of the posting and
permission to re-transmit or publish a post must be secured
from the author of the post.