From: Lou Judson <[log in to unmask]>
> The physical characteristics of both the recording and playback horns
> are very effective equalizers! Else they would have actual bass, for
> examle if a larger horn were used at each end.
> Very MUCH affecting the responseof the recording. <L>
But that is not EQ, that is a High Pass Filter.
However, is a ONE HUNDRED TWENTY FOOT HORN WITH AN EIGHT FOOT BELL big
enough for you????? Because THAT is what Edison built around 1920 and
used it experimentally and even issued a few Diamond Discs from it. (It
was scrapped during WW II and one section remains. I took photos of the
location where it was.) Many of Edison's regular recording horns were
4 to 6 feet long, and many of these horns still exist. Furthermore, the
Orthophonic horn is also a designed as very long folded horn. To match
it, Walter Welch used to demonstrate a pair of Lab Model Diamond Disc
machines which were driven by a joined single electric motor. He would
play two identical pressings simultaneously as a way to effectively (so
he conjectured) double the length of the reproducing horn to improve
bass response. I did not notice the improvement when he demonstrated it
for me, and I think that this was one of the experiments he planned for
Bill Storm to work on in the recording studio they built in the Belfer
Labs building (but was usually used for storage.)
Mike Biel [log in to unmask]
On Nov 15, 2009, at 7:31 AM, Steven Smolian wrote:
For acoustic recordings, there is no eq curve.