Martin... these numbers refer to a particular coincindent partial pair found within the octave harmonics. If you have studied a bit of theory then you know something about the harmonic series. You should also know that one can (for all practicle purposes) only match 1 pair of coincidents within any given interval at a time. A 4:2 octave refers to the 4th partial of the lower note and the 2nd of the higher note. Likewise with the 6:3. The difference really depends on the pianos inharmonicity, but generally we can say that partial pairs with higher ratios are wider (farther apart) then those with lower ratios. There is a good book available from the PTG home office called "On Pitch" by Rick Baldersin that goes into quite some detail about Octave types. But again, unless you couple your reading with lots of hard work and most preferably some direct help from a knowledgeble technician, then you are going to have difficulty in succeeding. You say you have a teacher ? Perhaps you might tell us a bit about what this course was.. how long it took, what your studies included ? I understand you have been contacted by one of our better known Nordic piano technicians. I would encourage you to take whatever advantage you can of her knowledge and experience. martin store wrote: > what is the difference between 4-2 octave and 6-3 ??? -- Richard Brekne RPT, N.P.T.F. Bergen, Norway mailto:Richard.Brekne@grieg.uib.no
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