Power Up/Down Sequence

Posted by: Graeme H on 07 April 2016

Of coure I normally leave everything powered up, but there are occasional times I have to turn things off and I'm unsure on the correct sequence following a change in my set-up.

It used to be very simple: The 200/202 amp combination and a CD5x with a Hi-Cap on the CD5x. Powering up I used to switch on the CD player and the Hi-Cap first (never sure if it made a difference which way round) then the Amp. Powering down in reverse: amp then CD player.

Since then an NDX has been added and the Hi-Cap moved to the amp. I've tried following the same sequence, ie CD and NDX first on powering up, then Hi-Cap and amp - sequence reversed when powering down - but now I get a horrible spike which sounds terrible through the speakers (of course I have the volume turned all the way down).

What sequence would other posters use for powering up and down?

Thanks

Posted on: 07 April 2016 by Mike-B

Hi Graeme, the rule is power (NAP200) OFF first & last ON, the rest is not so important. The off sequence is Power, Pre/HC & Source(s) On sequence is Source, Pre/HC & Power

https://forums.naimaudio.com/to...d-power-off-sequence

It reads like you're doing it right so I suspect its about capacitor discharge times, I normally wait for the logo & button lights to go out before going to the next switch.

Posted on: 07 April 2016 by Bruce Woodhouse

Source first off and last on. Work down the chain of components and vice versa. I believe I've seen this advised on the Forum before-have you done a search?

This appears to be the opposite to what you describe.

Bruce

Posted on: 07 April 2016 by Graeme H

Thanks Mike-B and Bruce. Source first off and last on is what I always understood (sorry Bruce if my description was unclear) but perhaps taking more time between switching off the Hi-Cap and then the amp might help. I'm certainly getting the problem when powering down and I think also when powering up but I may be getting muddled! The system is currently off (work being done in the house) so I'll see what happens when I power up again.

Posted on: 07 April 2016 by hungryhalibut

Power off first. Power on last.

If you and Bruce are doing it the other way round, you are doing it wrong.

Posted on: 07 April 2016 by GraemeH

This could get confusing...

Posted on: 07 April 2016 by David Hendon

I would say power amp on last and off first as well. You need to protect your loudspeakers. The rest can look after itself.

best

David

Posted on: 07 April 2016 by hungryhalibut

GraemeH posted:
This could get confusing...
G

It's not confusing at all. Power amp on last and off first. If anyone says the opposite, they are wrong, and that's that.

Posted on: 07 April 2016 by GraemeH

Hungryhalibut posted:
GraemeH posted:
This could get confusing...
G
It's not confusing at all. Power amp on last and off first. If anyone says the opposite, they are wrong, and that's that.

Umm...no. I meant GraemeH & Graeme H...

Posted on: 07 April 2016 by hungryhalibut

Ah! I was somewhat concerned that you were losing your marbles...

Posted on: 07 April 2016 by Don Atkinson

HH is right.

Switch the POWER AMP(S) off first. Wait until you hear the "Plop" through your loud speakers which confirms that the power amps have indeed switched off. This can take quite a few seconds !!

Then and only then, switch off the other components, preferably working back in sequence through the pre-amp (and its power supply if it's not fed from the power amp) to the various source components.

Switching on is the reverse ie Sources, Pre-amp (if it has a separate power supply), then finally the Power Amp(s). Again, it's worth waiting a few seconds between each component before switching the next one on.

Make sure the VOLUME control is at Zero before switching things OFF or ON.

Posted on: 08 April 2016 by charnik

Yesterday in order dress cables at the back of the system i switched off Hicap that powers my 282 but i didnt do the same for 250. The result was some noise when i tried to disconnect snaic that powers 282 from hicap. Why this happened? Ok , the switched off Hicap is also connected with 250 but it was ...off