SJM wrote:I don't quite understand.
Once the water pours over the grounds in the filter, "on" or "off" has no meaning.
The water sits in the cone until I open the closure at the bottom.
All "on" does is tell the machine to heat the the water and then to release it when it is the correct temperature AND the carafe is pushed in under the cone.
(Also, I am probably not as astute at parsing out the subtle difference you are looking for/at, but....probably someone else here would be better able to do so.)
You'd just be drawing out the total brew time, and the pre-wetted bed would be slightly cooler in temp. But you can't really drag out the "pre-wetting" phase (or whatever someone wants to call it), very long, because if the unit is on, the water will still flow into the basket and risk overflowing if the bed is already fully saturated.
Turning it off for about 45 seconds would allow the coffee to fully off-gas during that "pre-wetting" phase and likely yield a higher extraction. But this is just a guess.