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Cantilever energy harvesters have presently been tuned by manipulating beam dimensions or by placement of a tip mass. While these techniques lend themselves well to designing a highly tuned resonance, the design is fixed and each system is unique to a specific frequency. Here we report investigations of magnetic potential well tuning to vary the spring constant, which shifts the resonance. The significance of this work is the design of a harvesting system with variable resonance, adjusted by changing the effective spring constant by means of shaped pole-pieces on a pair of magnets. Wider tuning range with reduced tuning force is thus achieved.