The term "Shaded Dog" refers to the label RCA used at the time which was a
tomato label with an image of Nipper on a dark plum shaded half circle,
hence the term "Shaded Dog". You can see images at

I must disagree with an earlier post that is confusing Dynagroove with
Dynaflex. At the advent of the Dynagroove era, RCA was still issuing
full-weight pressings that were largely identical to what had come before.
It was merely the content that was adulterated, the pressings themselves
were fine. As we sank into the dark days of the early 70's, RCA introduced
Dynaflex which was intended to save them money as it used MUCH less vinyl. I
believe they were 80 gram pressings. They were pathetically thin and warped
if you looked at them wrong. I'm not entirely sure but I think RCA had
discontinued the use of Dynagroove by the advent of Dynaflex. 

Apparently someone at RCA was smart enough to realize they didn't want to
use the process on the master tapes. Four track reels from this era bear
this out, as do Chesky and other re-releases of the same material. 

-----Original Message-----
From: Association for Recorded Sound Discussion List
[mailto:[log in to unmask]] On Behalf Of Lou Judson
Sent: Sunday, February 12, 2006 8:21 PM
To: [log in to unmask]
Subject: Re: [ARSCLIST] Dynagroove, was Record tracking

Thanks, This is all very good to know, as I don't listen to very much  
recorded classical music as I used to.
One more question - what is this term "shaded dogs?" as in

"These original session tapes while being closest to what was  
originally recorded in the concert hall, in many cases do not resemble  
the original shaded dogs in sound."
  from the Chesky site...

Lou Judson . Intuitive Audio

On Feb 12, 2006, at 5:47 PM, phillip holmes wrote:

> They compressed it, rolled off the bass and purposely introduced  
> distortion in the inner grooves.  It was a variable EQ process too,  
> boosting lows in quiet passages and rolling off treble near the inner  
> grooves.  I don't know why, they just did.
> From Chesky records:
> body_librarydetails.cfm%3Fnewsid%3D171+rca+dynagroove+process&hl=en&gl= 
> us&ct=clnk&cd=5
> This reissue choice by Chesky is an especially interesting one. The  
> original shaded dog release of this recording (catalog no. LSC-2614)  
> was the first classical recording by RCA issued with the Dynagroove  
> process=