The short answer
A handmade bowl can be selected or adjusted near a target note, but “perfectly tuned” is meaningless unless the tuning reference and permitted tolerance are stated. ANURAVA should publish the measured frequency, nearest note and cents deviation — for example, “G3 +12 cents at A4 = 440” — instead of presenting a broad handmade note label as mathematically exact.
Musical conventionMeasured by ANURAVA
What “tuned” has to mean to mean anything
Musical convention
A tuning claim needs three things: a reference, a target and a tolerance. Without the reference the target has no frequency; without the tolerance the claim cannot be checked. “Tuned to G3” supplies none of them. “G3 +12 cents at A4 = 440 Hz” supplies all three and can be verified by anyone with a tuner.
Cents, and why they are the right unit
Musical convention
A cent is one hundredth of a semitone, and because it is logarithmic it describes the same perceptual distance anywhere in the range. Ten hertz is an enormous error at C3 and a small one at C6; ten cents means the same thing in both places. This is why tuning tolerance is quoted in cents rather than hertz.
What hand-forming implies
A bowl raised by repeated hammering acquires a wall whose thickness varies slightly around its circumference, and that variation is part of how it sounds. A maker can select pieces that fall near a target and can adjust within limits, but driving every piece to an exact value would mean removing the variation that gives hand-raised bowls their character — and it would still leave the paired-mode split that produces beating.
The honest format
Nearest note plus cents offset against a stated reference, for example: G3 −17.6 cents, A4 = 440 Hz. The figure shown here is a format illustration, not a measurement of any instrument.
Frequently asked
Can handmade bowls be tuned exactly?
They can be selected and adjusted close to a target, but ‘exactly’ has no meaning without a stated reference and tolerance. Hand-forming also produces mode splitting that a single exact number cannot describe.
How close to a note should a tuned bowl be?
That depends on the tolerance the seller commits to and states. The useful question is not ‘is it tuned’ but ‘what is the measured offset in cents, against which reference’.
What does cents deviation mean?
How far a measured frequency sits from a reference note, in hundredths of a semitone. It is calculated as 1200 × log₂(measured ÷ reference), and it describes the same perceptual distance at any pitch.
Sources & methodology
- StandardISO 16: Acoustics — Standard tuning frequency (Standard musical pitch)International Organization for StandardizationSpecifies A in the treble stave at 440 Hz; confirmed current in 2022.
- First-partyANURAVA Acoustic Method v1.0 and Sound Passport recordsANURAVAFirst-party measurement protocol and per-instrument documentation.
Written and reviewed by ANURAVA. Where a statement rests on a musical convention or a traditional association rather than on measurement, it is labelled as such in the text above.