Weird Sound After Shutdown

deronb1
deronb1 Posts: 5,021
edited September 2012 in Electronics
About 30 seconds after I turn off my Adcom GFA-555 I hear a weird sound out of the left speaker. Sounds like a high pitched **** or something. Only happens once, but happens everytime after shutdown. What is that?
Post edited by deronb1 on
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  • soundfreak1
    soundfreak1 Posts: 3,414
    edited September 2012
    Cant think of anything good about an amp sending any kind of signal to speakers after shutdown. If you are not tech savy i would het that cked out before using again!!! Cant imagine anything ( except a cap not discharged at shut down firing late?). Either way not a good thing. If you are tech savy put a volt meter on the outputs and monitor it till it happens and see what it is. I have been told that the 555's do have some probs with the power supplys or at least are known for tjem. Though i have never owned that model ( mostly due to that warning)
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  • george daniel
    george daniel Posts: 12,096
    edited September 2012
    typical with adcom 555's,,mine did that too.
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  • heiney9
    heiney9 Posts: 25,166
    edited September 2012
    Completely normal as the Adcoms don't believe in using current limiting or muting circuits. Turn the pre-amp off first and you woin't hear that sound.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • scottyboy76
    scottyboy76 Posts: 2,905
    edited September 2012
    Same thing with my newly acquired 555, same exact description i thought of for the sound.

    Good to know from 2 of the real experts around here that its no biggie.

    And by experts, i mean the sound from the amp, not the sound of high pitched farts, just to be clear.
    humpty dumpty was pushed
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  • stretchl
    stretchl Posts: 1,334
    edited September 2012
    Perhaps a group of cowboy gnomes having dinner around a campfire inside your speaker?

    http://www.youtube.com/watch?v=idHDB0KcNlI

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  • deronb1
    deronb1 Posts: 5,021
    edited September 2012
    heiney9 wrote: »
    Completely normal as the Adcoms don't believe in using current limiting or muting circuits. Turn the pre-amp off first and you woin't hear that sound.

    Whew! Good to hear. Thank you gentlemen.
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  • zingo
    zingo Posts: 11,258
    edited September 2012
    I've had that sound with an amp before too. Didn't cause any issues, but wasn't a pleasant sound either; never found the cause of it.
    Jake
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  • polkatese
    polkatese Posts: 6,767
    edited September 2012
    Has that sound coming off Adcom 535 on mine too. Is that really the sound of caps discharging, if there is such thing?
    I am sorry, I have no opinion on the matter. I am sure you do. So, don't mind me, I just want to talk audio and pie.
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  • heiney9
    heiney9 Posts: 25,166
    edited September 2012
    polkatese wrote: »
    Is that really the sound of caps discharging, if there is such thing?

    Yes, that's exactly what it is. Again turn the pre-amp off first and you won't hear that sound.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • unc2701
    unc2701 Posts: 3,587
    edited September 2012
    Yep, another Adcom owner that's had that. Totally normal.
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  • BlueFox
    BlueFox Posts: 15,251
    edited September 2012
    If the caps in the amp are making the noise then why would turning off the pre-amp first stop the noise? The speakers are connected to the amp, the caps are still going to discharge, and the circuit to the speakers still exists.
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  • heiney9
    heiney9 Posts: 25,166
    edited September 2012
    Hmmm... good point. I need to search my memory banks since it;s been awhile since I've had Adcom gear. There was a way to keep from hearing that noise. To anyone with earlier Adcom amps, try it both ways and report back.

    H9

    P.s. Maybe I got so used to it I stopped noticing it and that's why I think there is a way to prevent hearing the noise. IDK, it was awhile ago and something that never bothered me.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • unc2701
    unc2701 Posts: 3,587
    edited September 2012
    Now that I'm thinking about it, I think it wouldn't happen if the preamp was ON and the volume down. If you leave your music playing, and turn off just the amp, you'd continue to get sound until the caps discharge- as it starts to go, the music sounds a little "static-y" then cuts out.

    With the preamp on and the volume down, the adcom continues to amplify the zero signal and doesn't give the "****". But it's been about 5 years since I had an Adcom.
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  • Syndil
    Syndil Posts: 1,582
    edited September 2012
    polkatese wrote: »
    Has that sound coming off Adcom 535 on mine too. Is that really the sound of caps discharging, if there is such thing?

    Ding ding, winner. All of my Adcom amps have made that sound. Turning the preamp off first does not make a difference. You can play music as the amp powers off but the sound it makes when doing this is worse than just turning it off, IMO. More of a high-pitched staticky sound, which I would presume comes from the amp trying to process high-frequency sound in the music.

    I've never found a way to totally prevent the noise, but it seems if you cut power to the amp instead of turning it off with the switch on the amp it makes less of it. Same with the current inrush buzz when turning it on.

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  • danger boy
    danger boy Posts: 15,722
    edited September 2012
    "high pitched ****" LOL i love that...
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  • unc2701
    unc2701 Posts: 3,587
    edited September 2012
    Syndil wrote: »
    Same with the current inrush buzz when turning it on.

    I kinda liked the inrush buzz. Lights would dim/flicker, get that buzz, if it was a movie, someone would say, "S#!t just got real"
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  • FTGV
    FTGV Posts: 3,649
    edited September 2012
    Syndil wrote: »
    Turning the preamp off first does not make a difference.
    I think it's good practice to turn the amp off first (and on last) as some preamps can emit a transient noise spike or DC at turn on/ turn off .It could potentially be an issue for speakers with a DC amplifier.
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  • 11tsteve
    11tsteve Posts: 1,166
    edited September 2012
    FTGV wrote: »
    I think it's good practice to turn the amp off first (and on last) as some preamps can emit a transient noise spike or DC at turn on/ turn off .It could potentially be an issue for speakers with a DC amplifier.
    this is what i have always done, but do you know a good way to teach the wife how to remember?:smile:
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  • FTGV
    FTGV Posts: 3,649
    edited September 2012
    11tsteve wrote: »
    this is what i have always done, but do you know a good way to teach the wife how to remember?:smile:
    If threatening to take away the Amex card does'nt work you might want to try the Smith & Wesson option.:cheesygrin:
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  • audiocr381ve
    audiocr381ve Posts: 2,588
    edited September 2012
    My 545 did that too. No worries!
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  • 11tsteve
    11tsteve Posts: 1,166
    edited September 2012
    FTGV wrote: »
    If threatening to take away the Amex card does'nt work you might want to try the Smith & Wesson option.:cheesygrin:
    :lol::lol::lol:
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  • Drenis
    Drenis Posts: 2,871
    edited September 2012
    Never shut the pre-amp off first. Always shut the amp off first and turn it on last in the sequence.

    Don't listen to that h9 fella :razz:
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  • Syndil
    Syndil Posts: 1,582
    edited September 2012
    If your preamp doesn't thump when you turn it on or off, then it doesn't really matter, but if you are worried about thump then yes that's the way to do it.

    Anyway it's a moot point in my case since my amp is triggered by the pre. Turns on a few seconds after the pre, turns off simultaneously with the pre.

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  • deronb1
    deronb1 Posts: 5,021
    edited September 2012
    Still doing it no matter in what combination I turn stuff off. Don't really care if it doesn't hurt anything. Can blame the "****" noise on the kids for a laugh anyway :cheesygrin:
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  • unc2701
    unc2701 Posts: 3,587
    edited September 2012
    spam reported
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  • stretchl
    stretchl Posts: 1,334
    edited September 2012
    Drenis wrote: »
    Never shut the pre-amp off first. Always shut the amp off first and turn it on last in the sequence.

    Don't listen to that h9 fella :razz:

    I thought it was definitively established here a while back that a solid state amp is happier left in the "ON" position.

    Is there now dissent in the ranks?
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  • tonyb
    tonyb Posts: 32,967
    edited September 2012
    stretchl wrote: »
    I thought it was definitively established here a while back that a solid state amp is happier left in the "ON" position.

    Is there now dissent in the ranks?

    Nah.....just a matter of personal preference is all.
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  • strider
    strider Posts: 2,568
    edited September 2012
    stretchl wrote: »
    I thought it was definitively established here a while back that a solid state amp is happier left in the "ON" position.

    Is there now dissent in the ranks?

    Makes me happier to leave mine on all the time; the sound changes for the first 2-3 hours as it gets to operating temp otherwise. Far as the amp being happier, I dunno.
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