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"Pop sound at speakers" when switching off preamp

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skydna
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Hi-Fi 4 Sale - Malaysia / Singapore Audio Forum & Marketplace | www.hifi4sale.net :: Discussion Forum & Knowledge Base :: Equipment Discussions

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"Pop sound at speakers" when switching off preamp Empty "Pop sound at speakers" when switching off preamp

Post by hijau Mon Jul 13, 2009 5:04 pm

Afternoon,

Speakers put out a "soft pop sound" when switching off system.
Can anyone advice what is causing this problem?

Shut down step as follow;
Pre Amp "Volume down/mute" => CDP Off => Power Amp Off => Pre Amp Off, and follow by "soft pop sound"

Have try many sequence above seem to be the softest way to shut down system.

Thanks.

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"Pop sound at speakers" when switching off preamp Empty Re: "Pop sound at speakers" when switching off preamp

Post by kowtim Mon Jul 13, 2009 9:09 pm

Hi Hijau

The Rule:

Power amp turned ON LAST, only after turning on everything else first.

Power amp turned OFF FIRST, before turning off anything else.

Some systems do make small gentle "plop" sounds... it is quite normal. If it does not sound gentle, then get someone suitable to come take a look at it.

HTH

Regards

study
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"Pop sound at speakers" when switching off preamp Empty Re: "Pop sound at speakers" when switching off preamp

Post by hangleng Tue Jul 14, 2009 10:16 am

You may listen to some gentle plop sound, something like water flowing sound. It is actually DC discharge from caps from your power amplifier.

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"Pop sound at speakers" when switching off preamp Empty Re: "Pop sound at speakers" when switching off preamp

Post by car o scope Tue Jul 14, 2009 11:06 am

Why amps doing DC discharge with pop sound?

Hey, this sounds like my Exposure XX amp.
Have the pop sound sound when turn on and off.
Turn on will get instant pop.
Turn off will get pop sound after few seconds.
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"Pop sound at speakers" when switching off preamp Empty Re: "Pop sound at speakers" when switching off preamp

Post by wabun Tue Jul 14, 2009 11:48 am

it sound like a sticky relay... or leaky condenser. but if follow kowtim rules for last on 1st off for power amp. you shouldnt have any problem..be patient, turn on pre some time onlt turn on power amp
and turn off power amp some time only turn on preamp. the power amp has reservoir capacitor which can store power for few second and some big giant can store for minutes.. Laughing

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"Pop sound at speakers" when switching off preamp Empty Re: "Pop sound at speakers" when switching off preamp

Post by car o scope Tue Jul 14, 2009 1:53 pm

Well, I guess there will be no alternative for integrated amplifiers with those pop sounds, right?
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"Pop sound at speakers" when switching off preamp Empty Re: "Pop sound at speakers" when switching off preamp

Post by skydna Tue Jul 14, 2009 3:45 pm

I found some useful info with Google why pop sound generated~~

Basically, the pop is caused by the amplifier stabilising when
switched on. Amplifiers with split supply rails and no output capacitor will not necessaily come up totally symetrically, so some out-of-balance current will flow through the loudspeaker, causing a pop. Amplifiers with a coupling capacitor will have the capacitor charging current going through the loudspeaker, causing a pop. There may be a similar pop on switch-off.

http://newsgroups.derkeiler.com/Archive/Uk/uk.rec.audio/2006-03/msg00706.html
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"Pop sound at speakers" when switching off preamp Empty Re: "Pop sound at speakers" when switching off preamp

Post by hijau Tue Jul 14, 2009 8:09 pm

Thanks all.

Will try out some of the method share on above will feed back later.
My other concern will this cause any permanent damage to speaker?

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Post by skydna Tue Jul 14, 2009 8:19 pm

hijau wrote:Thanks all.

Will try out some of the method share on above will feed back later.
My other concern will this cause any permanent damage to speaker?

I think it will be ok as long as no DC current flow through speaker and the pop sound is not loud, for your information Naim amplifier has pop sound from speaker every time when turn on or off~~
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"Pop sound at speakers" when switching off preamp Empty Re: "Pop sound at speakers" when switching off preamp

Post by azri Wed Jul 15, 2009 10:21 pm

yeah, power amp last On, & 1st Off
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"Pop sound at speakers" when switching off preamp Empty Re: "Pop sound at speakers" when switching off preamp

Post by hazy Fri Jul 17, 2009 4:49 pm

hi hijau ,
take the several minute when turn off . one by one

power amp 1st then after couple of minute pre.


regard
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"Pop sound at speakers" when switching off preamp Empty Re: "Pop sound at speakers" when switching off preamp

Post by hijau Fri Jul 17, 2009 8:23 pm

Guys, After trying shutting down Power Amp for 15 min and above then follow by Pre Amp has solve the pop sound from poping.. Very Happy
Thanks..

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"Pop sound at speakers" when switching off preamp Empty Re: "Pop sound at speakers" when switching off preamp

Post by spinner Mon Jul 20, 2009 5:56 pm

once having this pop sound too on my new avr, a little loud and discomfort. Then, brought back to shop and exchange another one, all smooth and quiet. Smile

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"Pop sound at speakers" when switching off preamp Empty Re: "Pop sound at speakers" when switching off preamp

Post by leofric32 Mon Aug 03, 2009 10:43 am

dear all,

I just got my new Naim amp and notice that it does produce pop sound when turn on and off. I can't follow any sequence fr shutting off as the pre-amp does not have any on/off as it draws power from the power amp.

Does all Naim amp produce the pop sound and is it normal?

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