Robert Conrad, Registered Piano Tuner/Technician, Tucson, AZ

The A4 Numbers

 The A4 numbers are the first pieces of information used for the mapping.

The “A4 numbers” are the locations of the 2nd, 4th, and 8th partials  of A4 when A4 is tuned to A440 (1st Partial).

To measure A4’s 2nd Partial:
Tune A4 to A440.
Set the AccuTuner to A5, play A4, and stop the lights (with the cents buttons).
The cents setting is the location of A4’s 2nd P.

To measure A4’s 4th Partial:
Tune A4 to A440.
Set the AccuTuner to A6, play A4, and stop the lights(with the cents buttons).
The cents setting is the location of A4’s 4th P.

To measure A4’s 8th Partial:
Tune A4 to A440.
Set the AccuTuner to A7, play A4, and stop the lights(with the cents buttons).
The cents setting is the location of A4’s 8th P.

 

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