Hugh Robjohns wrote:I would even think like that the initial start up spike or spark from going from idle mode to active mode is more than leaving it on.
Is that based on your extensive knowledge and experience as a designer of professional and consumer electronics, or just the story you've invented to make yourself feel better?
No I did actually measured it, which was easily done, on another friends of mines autopowered off studio monitors. On the contrary, we made a bet. He bought them JUST for that apart from sounding great of course. For whatever bizarre rationale behind it. He's a phD in electrical engineering and acoustics and works for a cell phone company that develops mics, and sound part of cell phones. All of them, and then licenses them out. Not specific brand but subcontractor. He knows stuff. The units examined was Tannoy GOLD 7" actives. The new ones. NOTE : With SELECTABLE automatic standby mode.
He brought home meticulous measure equipment, not your regular voltmeter, and we measure the power grid wire to one speaker, with the standby function activated. It read in mA or A or microAmpere if you'd want to. We found no difference in three digit accuracy on the stream when the moniotors actually were in standby mode. I mean only then connected. There was absolutely no difference in "downstream" actually, the current reaching it. So, when we moved the signal to actually produce som signal, it woke up, and a very very slight surge was detected, but it still was within mA spike. Measurable though. How long a monitor should be active in order to make up for that, so it becomes an even wash, we didn't test. We just found a spike, no matter how slight, on this particular item.
I have very well slightly more understanding if it was a lightweight switching high powered amp or a complete fully compliant Class A toroid transformer amp active monitor. For generating excessive heat. However, it was SELECTABLE. It wasn't measurable with those things we had as a measurement or with these specific speakers. So for conserving energy it is a waste or a "hyped" environmental thing only. But in this select case, there must have been something to it whenever they add "selectable" option, that one can use it a a whim, or chose not to.