Power Delay Switch Required for Mixer

Discussion in 'Location Recording' started by unclejemima, Mar 15, 2011.

  1. unclejemima

    unclejemima Active Member

    I apologize in advance for my lack of technical knowledge, I will try my best :)

    We have a old 12 Channel Yorkville mixer that runs 2 self powered Mackie Speakers in a Worship environment.

    Right now, there is a delay switch wired in so that the mixer turns on first, then a half second later, the powered Mackie Speakers.

    Without this delay switch, every time we turned on the "system" it would make a large "bang" noise through the audio system (speakers). The delay switch has helped (not eliminated, but helped)

    So now we are adding some new XLR runs for some monitor speakers (self powered) and we are debating if the power connection for the self powered monitors should also be run through this delay switch?

    Is this set-up correct? Can we eliminate the delay switch totally or is this a normal thing?

    Thanks kindly,
  2. dvdhawk

    dvdhawk Well-Known Member

    It's not normal and will shorten the life of the speaker components - especially the horns - if it is left unchecked.

    I've used the Mackie SRM-450's before at a place that had a couple pairs of them hanging out of reach in the 'house-system'. I don't recall them making much more than a very soft thud powering up. I don't know which powered Mackies you're using - but the 450's can be set to switch themselves off and on based on whether or not they sense sound.

    Also, if you're using something like a Furman Power Sequencer as your delay switch, lengthening the delay will most likely solve your problem. You can adjust the delay time via an internal potentiometer (consult the manual). If it's some other type of rig - see if you can add a couple more seconds to let the Yorkville finish surging before the Mackies power up.

    An alternative might be a simple switch to disrupt the XLR between the Yorkville and Mackies until the surges have passed. {it would have to be a high-quality switch since the audio signal would pass through it} You could test that procedure by physically disconnecting the XLR at power up.

    Best of luck!
  3. unclejemima

    unclejemima Active Member

    Perfect, thank you!
  4. unclejemima

    unclejemima Active Member

    Oh, I forgot the main reason why I made this post. We already have the delay switch installed, and I will fine tune it, so this is good. Thanks for clearing that up.

    The real reason I started the post is we are running a few XLR cables from the mixer to a floor box for use with self powered monitor speakers. The monitors need to plugged into an A/C source at the floor box area. Should the A/C power at the floor box also be tied into the delay system or can it just run on a regular A/C power without being tied into the delay switch used at the mixer?

    Thanks kindly,
  5. dvdhawk

    dvdhawk Well-Known Member

    It shouldn't be necessary to pull AC cables from the monitors to the power sequencer (delay). It's always best to observe proper start-up and shut-down procedures. That is what your power sequencer is doing for you, turning things on 1,2,3 and shutting them down 3,2,1.

    The thing to keep in mind is, you're trying to avoid amplifying the spikes caused by the other equipment - which can damage the speakers. So, the power amps, or in your case self-powered speakers, should be the LAST thing you turn ON and the FIRST thing you turn OFF.

    The monitor speakers should be within easy reach, right?

    1) Turn on the Yorkville using the "delay switch" - wait at least 5 seconds
    2) Turn on the monitor speakers

    To power OFF:

    1) Turn off monitor speakers - wait at least 10 seconds
    2) Turn off Yorkville via "delay switch"

    No high-tech solution needed if you can easily reach the ON/OFF switch to the speakers in question.

    I'm assuming the powered speakers from the original post are out of reach and that is what necessitated the power sequencer. If not, you could have saved a lot of money by powering things up in the right order.
  6. unclejemima

    unclejemima Active Member

    dvdhawk, that makes perfect sense. Thank you kindly.
  7. dvdhawk

    dvdhawk Well-Known Member

    You're very welcome. I'm glad to be of service.
  8. TheJackAttack

    TheJackAttack Distinguished Member

    It should be noted also that if the main outputs of the mixer were pulled all the way down you wouldn't get a big thump either.

    Furman makes miniports to extend the PS series so you could add components to the startup sequence.
  9. unclejemima

    unclejemima Active Member

    TheJackAttack, thanks. Good to know.

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