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I assumed these days, that all had this capability to sleep after a designated period of inactivity, and instantly spring to life when the next note sounded. Am I right?
The ones I'm bothered about;

JBL LSR 305

Rokit 5s

Presonus Eris E5

Pioneer SDJ 50X

Well, I know they're not on your list, but my HS7s are of a similar type to the KRK Rokits. And my Yamaha HS7 certainly do not have any automatic shut down. They are just power amps and speakers with an on/off switch on the back - so you have to fiddle around the back of each one to put them on or off.

You should probably put JBL 305/308 on the “no” list.

There is nothing in the literature included with my 308s indicating support of auto-standby / inactivity mode, there is no hardware switch / button or other actuator to enable/disable, nor have I ever noticed any indication of such behavior during periods (hours) of inactivity ..... just saying, if they do in fact support this feature it must be considered a stealth feature for which manufacturer prefers the end user to remain unaware 🙈 🤫

Thank you guys; I just checked the Pioneer ones; they at least, do have a 30 min shutdown facility.

Same with Presonus Eris 5 (no auto power off).

Have we become so lazy that turning off a switch is too much work?

I guess so. I've earned the right to be lazy; I expect my piano to play when i hit the notes, not after jumping through hoops . . . .

There are motion detection power strips, switches and gizmos that might help:

https://www.tricklestar.com/products/motion-sensor.html

KRKs also have this feature, it is about 20 minutes. While I am not the lazy type, I switch off the 'puter every day. It is a nice feature to have on monitors, most models the switches are at the back and can be hard to see/reach once setup, so I don't bother switching them off.

The Eris E5 don't, pretty sure about that from memory, but check the manual to be sure.

It can be a useful option on a variety of equipment. It’s easy to be interrupted, sidetracked, or just forgetful in older age, and the equipment auto power off can then be appreciated. Of course some people leave some equipment on all the time, even when it’s performing no useful function. Ditch your TV remote, or these days your smart home remote, that’s where ‘we’ are going.

The Rokit 5 G3 doesn't appear to have auto switch off. The Rokit 4 G3 does. Strange . . . .

It would be interesting to hear from electrical engineers about how energy is typically used when a modern day amplifier is idling, when no incoming signal is applied.

I know from the 1960s that a tube amp was always generating heat but I would imagine that a transistor amplifier would behave more efficiently.

I actually l own the G3 RP6 and they definitely have that feature, so I can say first hand from using them. I doubt the RP5 is any different. The manual actually says it is 30 minutes, not 20 as I said, minor detail.


https://s3.amazonaws.com/gibson-pro-audio/krk/manuals/Rokit_cutsheet.pdf


Check the last page for confirmation.

If you check such info on store pages, be careful, it is not uncommon to see such mistakes.

I have a 100 Watt audio amplifier that drives speakers and has the power down feature. When I tried to measure the standby power, it was less than my meter could measure, 0.1 Watt. These amplifiers are typically used for remote in house speakers for which they are hidden in a closet and so it would be inconvenient to have to turn them on and off. I assume monitors would have similar circuits.

That's good. It's always best to check the manufacturer's info first.

Peter, I've just been doing some research on this matter and a review in Harmony Central lists the fact that the Yamaha HS series do NOT have a standby facility as a limitation. The upshot of which is:

1. Don't buy Yamahas if you want automatic shutoff..... they're seriously retro and you have to switch them off with your own hands actually manoeuvring a toggle switch on the back panel, possibly involving a journey from the position you are seated to the leftside sound reproduction sector of your living room. And repeat the entire process for the right hand speaker.

2. Since the reviewer saw this as a noted disadvantage (this was in 2013), you can reasonably expect a wide range of active monitors that do have a standby in 2018.

https://www.harmonycentral.com/expert-reviews/yamaha-hs7-studio-monitors

SoundThumb is right. Amplifiers use a trivially small amount of power when not driven.

I had an old chassis amp with those ubiquitous EL34s, ECC 83s and one or two EF86s too (I know my valves) and stuffed it in a home made box. Played guitar with it in several venues, but I forgot to put holes in the top o' the lid.

It got hot. It distorted; I quite took to the sound since it covered my imperfections nicely. But the rest o' the band weren't too happy with the smell. Or the smoke . . . .

Most countries legislated in 2013 a maximum of 1/2 Watt continous consumption for devices running in standby. I currently have 27 devices that could run 24 hours a day in my house. At 1/2 Watt, that is 118.26 kWH a year. If only two billion people have the same, that requires 27,000 megawatts of continuous generating capacity for us assholes who are unwilling to get off our asses and press a real switch.

I use power bars to shut everything down, except a few clocks.

In other words ... a totally trivial amount of power. Just a few hundred thousand dollars spread over two billion consumers. Really trivial.Conservation makes sense, but small conservation is a joke. It's as though there's an elephant in the room, and they want us to pay attention to a grasshopper.

I replaced 100 W incandescent lamps with 23 W compact fluorescent ones years ago. Big savings.
Now I use 7 W LED lamps. More savings.

But to worry about 0.5 W of standby power? How do you spell pfththththpf?