When broadcasting sports reports I'd written, I never felt the need to scream, shout, or convey manic enthusiasm. Instead, my delivery was polite and relatively subtle. Partially, that was simply my personality. I never thought it was necessary to screech; I announced the scores and highlights and figured the listeners could drum up their own enthusiasm, if they liked.
A newspaper reporter told me, "It sounds like there should be soft jazz playing under your sports reports." And, why not? A broadcaster shouldn't have to hit people over the head with information.