A comparison of the amplitude output and directivity of both pianos is thoroughly illustrated in the data above. This data shows for example, that the Stuart piano’s highest signal of leqA was recorded by the microphone No 6, ata level of 66 dBA, and the Steinway’s highest leqA was recorded by microphone No 2 establishing distinctive radiation directivities, in opposite directions! The sound level volume of the instruments is recorded by mic7, and we see here that the Steinway is 4dB louder in Lp peak, and an average of 4dBA louder than the Stuart piano, averaged over the 50s duration of the note.

C2 v81 MW mic8 Decay curve,50s duration.

The decay curve for mic 8 positioned at 90° and 6 metres from the pianos, shows an interesting area of difference in the rates of decay starting at5s.

The decay curves below, show the Stuart (i) to be decaying faster in the onset, and to be settling into its after-sound oscillation (ii) , approximately 5s earlier than Steinway (ii).