TS210 DI box needed for keyboard

New owner of a couple of TS210s. I want to use these with two of my keyboards. I wish to know the various ways that I can safely connect them. My outputs are 1/4" unbalanced outputs. With my other EV speakers I do sometimes use them without a di box or mixer, but always when connecting to a house pa.I am unclear if I always need to use my di box if connecting from my keyboard outputs directly into the speakers. Please advise. Thanks!
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