Noticed this with the geothermal generator specifically, which has a lovely dramatic sound profile up close - T-KA-T-KA-T-KA! - that I absolutely love, but which fades out to quiet when you move only a comparatively short distance away. Considering what a large machine it is, I feel like the sound should be more audible from further distances in order to convey the scope of it. The same goes for other large machines.
Obviously I know that if all machines made loud sounds that had a huge radius then there would be a lot of ambient sound clutter, but I think that a good compromise could be reached. Also with the geothermal generators you don't tend to have a lot of things clustered around the geysers, so it would be less of an issue.