Soundboard: At the 4 probe positions, the Stuart soundboard vibrated at 19% greater magnitude than the Steinway soundboard for C3v81.

The string scale of C3: The diameter of both wires is identical at 1.125mm. The tensile strength of the Paulello/Stuart wire is 140.5 N/mm² higher, the Roslau/Steinway is 41mm longer, and is set at 6.7kg higher tension. The yield or capacity of the Paulello/Stuart wire is 8% higher than Roslau/Steinway.

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Conclusion – Chapter 4.

The analysis of tonal colour of 96 piano tones of the sounds of two pianos, the Stuart No 19 (M19 STU) and the Steinway D No574500 (STE), found that three distinct transient qualities consistently combined to influence the distinctive tonal colour of the Stuart piano sound, across a frequency range C2 65.406 Hz to C5 523.25Hz, in a 180° sound field of 6 calibrated microphones, each positioned at an equal distance of 3 metres from the pianos, in the Music Workshop performance space, and struck at three calibrated velocities.

i) A slower fundamental frequency rate of decay,

ii) An earlier transition to the slower oscillation,

iii) A wider harmonic spectrum.

A calibrated microphone positioned at 6 metres distance from the pianos at 90°, provided sound data to support the finding that the Stuart sounds radiated to 6 metres were significantly louder and harmonically more balanced than Steinway, for the notes C2, C3, and C5 at each of the three calibrated velocity strikes.