Tls49 - I think you missed that my example included that the smaller diameter pipe had adequate capacity to carry "all of the available water" meaning that a larger pipe would never be able to carry more in reality because it simply wasn't available.
For example, if the water source was a water truck with a 6 inch outlet there would be a restriction at the source that would limit the benefit of having a larger hose attached. It's possible that having a hose that is larger than 6 inches might be an advantage, but at some point going larger would have absolutely no effect.
In audio, at some point a power cord will either be adequate to supply all available power (probably unlikely in reality) or it will be capable of handling an amount that is sufficient to supply everything that the power supply could ever ask. I think this is where Williewonka right on when he talks about dimenishing returns.
For example, if the water source was a water truck with a 6 inch outlet there would be a restriction at the source that would limit the benefit of having a larger hose attached. It's possible that having a hose that is larger than 6 inches might be an advantage, but at some point going larger would have absolutely no effect.
In audio, at some point a power cord will either be adequate to supply all available power (probably unlikely in reality) or it will be capable of handling an amount that is sufficient to supply everything that the power supply could ever ask. I think this is where Williewonka right on when he talks about dimenishing returns.