The aim of this study was to compare the vibroacoustic characteristics of two guitars, whose bodies were made of carbon-epoxy composites. The article presents vibroacoustic tests of the string and body carried out using microphones and accelerometers. The object of the research were electric guitars with different composite bodies. The phenomena occurring in the instrument during the creation and extraction of sound were described. The measurements were performed using various signal representations. A method of stimulating the instrument was proposed, which allowed for performing the tests in a repeatable manner. The methodology of the measurements was described, as well as the algorithm for analyzing the measurements performed using the selected method. Finally, the obtained results from all modalities and conclusions from the analyses were presented.