GAIN ON PREAMP VS GAIN ON POWER AMP


What gives better sound and or control of the bass. Increasing the gain on the preamp or increasing the gain on the power amp. Either way would you hear difference in sound quality?
samgar2

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My power amps have a gain setting of either 26 or 32db. Is it better to have less gain on the power amp and no increase in gain on the preamp which has adjustments as well?