The Columbia Lp Equalization Curve.

During the development of a design for an archival phono preamplifier, the author found a number of conflicting opinions on the nature of the recording curve used for the long-playing microgroove record introduced by American Columbia in 1948. This paper will discuss the various popular views on the Columbia curve, and the method the author used to verify its actual characteristics. This paper is based on a presentation given on 29 March 2008 at the ARSC Conference held at Stanford University in Palo Alto, CA. [ABSTRACT FROM AUTHOR]