Initial noise on power up of integ. amp

michael_w
michael_w Posts: 2,813
edited September 2004 in Electronics
Hey people I went on a little shopping spree and bought myself a couple things. One of which was a NAD integrated amplifer (c352). Its beautiful and I can't belive the difference it makes with my lsi7's but one thing I'm curious to know is that if its normal for it to send a wierd low frequency signal out of the preout to my sub when I turn the nad on and off. It doesn't really bother me I just want to make sure if it should be doing that. Thanks !
Post edited by michael_w on
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  • danger boy
    danger boy Posts: 15,722
    edited September 2004
    I've never heard of a integrated amp doing this... what kind of hum is it? like a hummmmmmm or more like a humm pop sound?

    some amps "pop" when turned on..

    how do you have your speakers and sub wired to the NAD?
    PolkFest 2012, who's going>?
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  • michael_w
    michael_w Posts: 2,813
    edited September 2004
    Its sort of a couple pops, kinda hard to describe. My speakers are wired just bare wire to the posts and my sub is hooked up to one of the pre-outs. I'm asuming if other amps "pop" its probably pretty normal.
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  • bknauss
    bknauss Posts: 1,441
    edited September 2004
    Its probably just turn on and turn off noise caused by the large differences in current when turning on/off.
    Brian Knauss
    ex-Electrical Engineer for Polk
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  • gidrah
    gidrah Posts: 3,049
    edited September 2004
    I have a McIntosh integrated that makes noise when I first power it up. It quickly goes away and I have dismissed it as the capacitors charging.
    Make it Funky! :)
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  • F1nut
    F1nut Posts: 50,761
    edited September 2004
    That isn't normal, IMO. Is the sub powered?
    Political Correctness'.........defined

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  • michael_w
    michael_w Posts: 2,813
    edited September 2004
    Thanks for the info ... I'm glad to know its not anything bad.

    F1nut the sub is powered but describing the sound as a pop makes it sound worse than it is. Its more of a little wave of low frequency sound.
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  • F1nut
    F1nut Posts: 50,761
    edited September 2004
    Try turning the integrated on first, then turn on the sub power.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • michael_w
    michael_w Posts: 2,813
    edited September 2004
    The sub turns on by itself it doesn't have a power on/off/auto switch... kinda crappy but I got a good deal on the sub. (its an athena sub 8 btw)
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  • F1nut
    F1nut Posts: 50,761
    edited September 2004
    Hmmmmm........well, either unplug it after use and then plug it back in after you turn on the amp, install a switch or live with what you have. :)
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • phoneisbusy
    phoneisbusy Posts: 867
    edited September 2004
    Does the sub make the same noise with another amp/receiver? Maybe it's the power up thump of the sub's amp?

    regards

    Dave
    Time is the best teacher. Unfortunately it kills all its students.
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  • michael_w
    michael_w Posts: 2,813
    edited September 2004
    Ok thanks people I just wanted to make sure it was supposed to make that noise and that I'm not fritzing anything.

    Phoneisbusy ... its the integrated amp because I've never heard that sound untill I incorporated it into my system and the sub doesn't do it with my other receiver.
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