I think you need to distinguish between hyper and excited.
Penny was/is a very excitable pup/dog. She'll be 6 Jan 3 and I just recently realized she's a low energy dog but very excitable.
For that kind of dog, which I believe most Goldens are, I suggest you use a soft tone of voice, in a regular pitch. The worse thing you can do with excitable dogs is to talk in a high pitched, loud, baby-talkey voice. They just go bonkers.
I would also suggest you take away toys that have squeakers in them. I believe these toys help to ramp up the excitment level. Give chews toys that have a flavor or a kong filled with treats. This will keep them quiet and focused while chewing.
Make sure your playtime is about the dog running and exercising: fetch, jogging with the dog. Don't play tug of war, not because of dominance issues but because it excites them.
If I'd known then what I know now, we wouldn't have suffered so long. Penny has outgrown a lot of her puppy excitement and she can tone it down when we tell her to. But to be able to do that took a lot of years and a lot of patience waiting for her to mature out of it.