Ovation Guitar #43 Internal Research & Development Test Document - Model 1689-8, S/N 0043-93

This is an internal Ovation research and development document from 1976 detailing the construction specifications and acoustic frequency response testing of guitar unit #43, Model #1689-8, Serial Number 0043-93. The first page records top construction details including brace weights, bridge specifications, and deflection measurements taken on 7/2/76 and 8/3/76, noting the installation on bowl and carbon splines on the neck. The second page shows a frequency response graph dated approximately 9/10/76, plotting the acoustic output in decibels across the full audible spectrum from approximately 30 Hz to 9397 Hz, with notable resonance peaks annotated at frequencies including 73, 180, 480, 580, and 802 Hz.