432 Hz or 440 Hz? What you will hear, how it feels to sing and how to choose a tuning

You sing one vowel and a harp sounds underneath it. Sometimes you immediately feel that the voice meets the instrument well. Other times you want to go a little lower or choose a different note. The conversation about 432 Hz and 440 Hz becomes more interesting when it starts with playing and listening.

At Sacred Forest, we choose A4 = 432 Hz because in our opinion it sounds softer, more pleasant and accompanies singing well. Our clients share similar impressions. It is worth knowing what this choice technically means, how to compare two tunings and when it is particularly important to match it to other instruments.

What does the number 432 actually mean?

The designation A4 = 432 Hz says that the note A in a specific octave is a reference point with a frequency of 432 vibrations per second. The other notes have their own frequencies. A harp described as "432 Hz" therefore plays many different sounds, not one frequency in all the tubes.

The international standard ISO 16:1975 gives a value of 440 Hz for the reference note A. It is a common reference point for musicians' tuning and collaboration. It is not an assessment of which sound someone should like more. ISO: tuning standard.

The other thing is the scale. Chakra C and Planetary C use C major, and Sun D uses D major. Two instruments can be tuned to A4 = 432 Hz and still contain different notes. When playing together, you need to check both elements: tuning and the set of notes.

How big is the difference between 432 and 440 Hz?

Keeping the same tuning method, lowering the A from 440 to 432 Hz shifts the entire material by approximately 31.77 cents, or a little less than one-third of a semitone. The frequencies drop by approximately 1.82%. It's a subtle change in pitch that's easiest to compare on the same piece of music.

The following values are calculations for equal temperament. They illustrate the principle; they are not measurements of a particular tube.

The calculations used the note frequency relationship described by the UNSW musical acoustics team. The interval in cents is given by the formula 1200 × log₂(432/440). UNSW: notes and frequencies.

Important detail: the difference is not 8 Hz for each note. For A5 it is already 16 Hz, because this note is an octave higher than A4.

Why can singing with 432 Hz feel pleasant?

When the whole instrument sounds slightly lower, the melody sung in the same octave also moves down. We like this feeling when singing calmly with the harp. We like the soft entry of the voice between notes and the freedom to stay on one note for a long time.

However, comfort also depends on how high and low a particular melody goes. The change from 440 to 432 Hz itself is smaller than shifting the song by a semitone. If the phrase is clearly too high, choosing a different key or octave will be a bigger change than the reference point itself.

Try simple dialogue: harp note, short hum, pause. Then add a second note and see if the voice wants to follow it. You don't have to sing exactly at the pitch of the higher tubes. In the Sacred Forest application you can first learn about the model layouts and look for convenient phrases.

How to compare two tunings with your own ears?

Select the same fragment, similar volume and the same listening method. Recording one harp in a reverberant room and another one close to the microphone compares many things at once. The difference you'll love may come from tone, workmanship, or room acoustics.

If you have two versions of the same recording, ask someone to play them without labeling them. Write down which one you want to hear again and what caught your attention. Only then check the labels. You don't have to recognize an tuning to have a preference.

When digitally lowering the pitch of a recording, pay attention to the tempo. Simply slowing down playback lowers the pitch and increases the duration of the song. Such an attempt changes two elements at once. To compare the tuning itself, it is better to keep the tempo, remembering that digital processing can also affect the sound.

Three tests worth doing with your own voice

First, without the harp. Sing a short fragment as it comes naturally to you. Choose a phrase or vowel that you can comfortably repeat several times. This will be your reference point while listening.

Then with one model. Check the starting note and ending of the phrase in the Sacred Forest app. If the end of the melody gets too high, try singing the whole thing lower or change the key of the accompaniment. The pitch shift from 440 to 432 is much smaller than a semitone change.

At the end with the whole set. If you are singing to a bowl, handpan or recorded backing track, repeat the rehearsal with it. You then choose the sound of all the music. Our preference for 432 Hz concerns the pleasure of such an encounter: the harp, the voice and listening.

When does matching the tuning matter?

If you play solo or sing with a harp, you have a lot of freedom. When you join a piano, handpan, singing bowls or recorded backing track, check their reference point. Two versions of what is nominally the same note may differ, and their superimposition may produce an audible pulsation.

So the information "my bowl is in C" is not enough. You also need an octave and a tuning. It's best to listen to the instruments together or compare reliable measurements. Harps are not tuned before each session like guitars, so it is worth making this choice before ordering.

Our standard is 432 Hz. If you are working with a 440 Hz set, ask about the possibility of making your chosen model in this tuning. And if you're choosing your first instrument, start with a scale where you feel like stopping, playing one more note and adding your voice.