Real time help Adcom 545ii

kidglove13
kidglove13 Posts: 207
edited October 2012 in Electronics
When I turned on my 545ii the drivers on the speakers extend out and then sucked in.

What could the problem be?

Thanks
Post edited by kidglove13 on
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  • Clipdat
    Clipdat Posts: 12,937
    edited October 2012
    Do they return to normal after that, or do they stay extended out or sucked in?
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  • kidglove13
    kidglove13 Posts: 207
    edited October 2012
    They return to normal, but they never did this before and there is a hum as well

    I am wonder if I have DCpower going to the speakers
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  • soundfreak1
    soundfreak1 Posts: 3,414
    edited October 2012
    Dont know for sure but power to the drivers was my first thought. I'd unhook the speakers and ck with a volt meter if u have one!
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  • Clipdat
    Clipdat Posts: 12,937
    edited October 2012
    One of my KRK RP6 G2 speakers has the woofer suck in a little and then slowly return to normal position every time I turn it on, but it's always done this so I just figured it was normal.
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  • kidglove13
    kidglove13 Posts: 207
    edited October 2012
    I took everything out of the chain and left just the amp hooked up to the speakers and it did it again powering on and off the drivers moving significantly.

    I even hooked up another pair of speakers and the same thing happen.

    How would I test to see if I am getting DC going to the speakers?
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  • kidglove13
    kidglove13 Posts: 207
    edited October 2012
    Anyone else with some insight?
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  • Outfitter03
    Outfitter03 Posts: 563
    edited October 2012
    You need to buy or borrow a voltmeter. You will measure on a DC scale while connecting the probes to the positive and negative terminals. There should be no input connected to the amp. If the components are good and the bias is set it should read 15 millivolts DC or less.
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  • dudeinaroom
    dudeinaroom Posts: 3,609
    edited October 2012
    Does this in and out motion happen really quick, under a second, or is it a slower progression?
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  • cnh
    cnh Posts: 13,284
    edited October 2012
    I'd have a professional check this out. I believe some Adcoms have no relay protection circuitry so you might fry your speakers if you continue with this and there are spikes!

    Be careful!

    cnh
    Currently orbiting Bowie's Blackstar.!

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  • Clipdat
    Clipdat Posts: 12,937
    edited October 2012
    dudeinaroom wrote: »
    Does this in and out motion happen really quick, under a second, or is it a slower progression?

    Mine happens quickly, lasting for about a second after turn on. What does this mean?
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  • dudeinaroom
    dudeinaroom Posts: 3,609
    edited October 2012
    If it is more than just a quick pop I would take it in for a check up
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  • F1nut
    F1nut Posts: 50,569
    edited October 2012
    kidglove13 wrote: »
    Anyone else with some insight?

    Yeah, it's broke. Take it to a professional because you can't fix it.
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  • kidglove13
    kidglove13 Posts: 207
    edited October 2012
    Dont have any intention on trying to fix it, I am handy but this is above my pay grade for sure

    I spoke to my amp guy and he is going to take a look at it.

    Thanks
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