Contiguous Major Thirds Accuracy?

[John Formsma]

On 10/28/08, Jeff Deutschle <oaronshoulder at gmail.com> wrote:
>
> Can you explain how the A3-E4 and E4-A4 beat speeds are equal in a 4:2
> octave?

No .... :-).  But, that's one of the tests for a 4:2 octave. The other
main one is the M3-M10.

The fact that a fifth beats a bit less than it's contiguous fourth is
because most tuners begin with a slightly expanded "4:2" octave.

E.g., A3-D4 is usually faster than D4-A4. But if they're equal
beating, it verifies a just 4:2 octave.

> On Tue, Oct 28, 2008 at 9:17 AM, John Formsma <formsma at gmail.com> wrote:
>
>>  <Snip>
>> Tune A4, then A3. Quickly tune D4 and E4 to see what kind of octave there
>> is (and also to "rough in" D4 and E4).  Just get those two test notes
>> close.
>>  Remember that a 4:2 A3-A4 octave will produce equal beating from A3-D4
>> and
>> D4-A4 (also A3-E4 and E4-A4).
>>
>> <Snip>
>> --
>> JF
>
>
> --
> Regards,
> Jeff Deutschle
>
> Please address replies to the List. Do not E-mail me privately. Thank You.
>


-- 
JF