C4 Directivity

The Stuart and Steinway pianos radiated waves
of maximum SPL of the note C4
in four directions within the 180° array, to mics 1,2,4, & 5. The sounds C4 v54 mic1, and C4v54 mic5 will be discussed in this section, as C4 sounds to mics 2 & 4 were examined in preceding sections, of this chapter.

The Steinway piano sound radiated maximum SPL of C3 to mic 1, and the Stuart to mic 5:

The instrumental volume was similar,
for both pianos:
C4v54 mic7 : STU 89 dB STE 86 dB

Soundboards: C4v54:
The Stuart soundboard resonated larger amplitudes of the fundamental and 2nd partial frequencies. Overall, the Stuart soundboard vibrated at 71% greater magnitude than the Steinway soundboard for C4v54

C4 String scale:
The diameter of the Paulello/Stuart wire is .25mm thicker, the tensile strength of the Paulello/Stuart wire is 177 N/mm² higher, the Paulello/Stuart is 1.5mm longer, and is set at 3.5kg higher tension.

The yield or capacity of the Roslau/Steinway wire is 3.6% higher than Paulello/Stuart.