Not matching produces more 2nd harmonics ie 2nd harmonic distortion which is a good thing.
2nd harmonic ie doubling of frequency is close to an octave. 3rd harmonic ie 3xf is close to an octave and a 5th. For example if the input signal is a C3 (DO) the 3rd harmonic is G4 (SOL).
Perfect matching cancels all even order harmonics.
References:
Applied Electronics - T.S. Gray - MIT
Radio Engineering - F. Terman - McGraw Hill
Tubes vs Transistors, is there an audible difference? - Russel O. Hamm - JAES
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