Ovation Adamas 1687-8 Guitar #0045 Internal Research and Acoustic Testing Document

This is an internal Ovation research document from 1976 detailing the construction specifications and acoustic measurements of an Adamas model 1687-8 guitar, serial number 0045. The first page records construction details including top angle, brace weights, bridge dimensions, and deflection measurements taken at multiple stages between July and November 1976. The second page contains a frequency response graph (sound spectrum analysis) conducted by technician D. Johnson on November 30, 1976, showing the acoustic output of the guitar across a wide frequency range with a note that overall amplitude is probably too low by 2.5 dB.