| this won't harm your bass, the only thing that would freak me out are action and fret buzzing issues. there is a lot of change in string pull when tuning all strings down which means you have to set your trussrod different than before.
anyway, when you're going to record this, let the bass rest in desired tuning for at least 24 hours, then do a quick setup.
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Spector NS4CR, EADG, jazz ----- Ibanez BTB205, AEADG, electro
Peavey Zodiac DE, EADG, funk ----- Peavey Cirrus AC BXP, HEAD, boredom-issues
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