Kamehameha vs Galick Gun Ocean Dub Dragon Box - YouTube
I just attribute the voice change to the change in characters. Young, maniacal vegeta -> older good guy. Young, naive goku -> older, hero-of-the-galaxy SSJ goku lol
The change wasn't that apparent til the beginning of android saga where Funimation's crew stopped trying to imitate Ocean (vegetas voice actor specifically).
Man, just re-watching that shyt brought back dem chills. Vegas was at his rawest form right there.
After this though, the series continuously and erroneously started throwing Vegta under the fukking bus in disgust. Duke took a Kiao-ken XS3 beatdown, a planet destruction strength Kamehameha and a fukking spirit bomb and was still ready to throw down, yet in so many sagas afterwards, some light ass beatings was enough to have him throwing in the towel!?
This was the point when I seriously started questioning Dragonball's power level consistency or lack thereof with how dirty they treated Vegeta. I watched up to the GT saga, but I knew long before then that the series was shark jumping and despite the many high notes after this battle, I continued to be let down by DBZ.