I have the 103 mounted on a Grace 707 arm. Sounds fine to me! The lighter the arm the higher the resonant frequency of the cartridge suspension/arm mass. The heavier the arm the lower the resonance.
To any of the above, try a high quality heavier headshell, like the Ortofon LH9000 or the AV101 Orsonic, and I think you’ll realize an improvement, even though you’re presently satisfied. It’s not only about the resonant frequency equation.
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