Poping when I turn off the Pioneer AV

Tomasito

Hello,

I recently connected a Yaqin CD3 in between my VSX94TH pioneer AV and the Rotel 1095 amp. Everytime I turn it off. A popping sound is made when I turn it off the system. The popping sound is loud

I think this is not good for the speakers.

I tried turning off the CD3 first, and also tried turning it off first and waiting for a minute before turning off the system. But I still hear the popping sound.

Is this normal?

If not , what might be the problem.

thanks

McLoki

I get that every time I turn off my amp. It won't hurt your speakers.

if you want to be sure - take an SPL meter and measure how loud the pop is - then keep in mind that it takes about 1 watt to make around 87-93db at 1 meter with your speakers. I am guessing you are sending much less than 1 watt to the speaker.

(it was explained to me as the caps in my amp discharging, but I do not know that for sure - I just know in the 3 years I have had my system, it has always done it and not caused any damage yet.)

Good Luck,

Michael

thsmith

Tomasito wrote: »

Hello,

I recently connected a Yaqin CD3 in between my VSX94TH pioneer AV and the Rotel 1095 amp. Everytime I turn it off. A popping sound is made when I turn it off the system. The popping sound is loud

I think this is not good for the speakers.

I tried turning off the CD3 first, and also tried turning it off first and waiting for a minute before turning off the system. But I still hear the popping sound.

Is this normal?

If not , what might be the problem.

thanks

Have you tried turning off the AMP first ?

Tomasito

yes, I tried turning off the amp first. The popping sound still happens

Tomasito

McLoki wrote: »

I get that every time I turn off my amp. It won't hurt your speakers.

if you want to be sure - take an SPL meter and measure how loud the pop is - then keep in mind that it takes about 1 watt to make around 87-93db at 1 meter with your speakers. I am guessing you are sending much less than 1 watt to the speaker.

(it was explained to me as the caps in my amp discharging, but I do not know that for sure - I just know in the 3 years I have had my system, it has always done it and not caused any damage yet.)

Good Luck,

Michael

I will measure tonight... I'll see how much SPL I am getting
thanks for the suggestion.

McLoki

Keep in mind that whatever the efficiency of your speakers are - There amp power goes up by double or down by half for every 3db change. It is also possible that, depending on how close the speakers are to each other, your starting DB (efficiency of your speakers) needs to be increased by 6db. (because the efficiency listed is for one speaker producing the sound, not two.

I am guessing the sound you are hearing is in the high 70's or low 80's in DB and is way under about 1/4 of a watt in power. You really should not have any issues.

Michael

ShinAce

I don't think an SPL meter is going to help you, or even give you a good reading. You would need to trace the signal the speaker is receiving with a scope that records and then go back, check voltages, and roughly determine power from that. Either way, SPL meter is not worth your time and will not give you accurate or useful information. The pop is just too short for the meter to fully read.

I find it really weird that it would happen with the Rotel turned off first.

Have you tried taking the CD3 out for a bit to see if it's actually the cause?

McLoki

I was able to read it with no problem with mine. (but I have an analog meter and have never used a digital one)

Mine will pop with the amp being the only thing on in the system and then turning it off....

BTW - with the meter set at C weighting and fast response - I get about 71db with mine. while I do not know how much power that is, with my speakers being 87db efficient - I know they are getting WAY under 1 watt of power when i shut off my amp.

Michael

LuSh

It could be two things:

Leaking capacitors in in your AVR or amplifier which leaks when one component is shut off. This happened when I used an older NAD CDP with external DAC. If your AVR uses a two pronged AC power cable and your two channel amplifier uses a grounded three prong this could cause issue as well. I purchased an adapter which I run from my AVR to my 2 Channel Integrated and it improved the cross talk problem I would sometimes run into. All that being said I believe the problem is a leaky capacitor somewhere in your chain, likely the AVR.

Tomasito

hello Mcloki,
I don't know the efficiency of the speaker I am using. I am using LSi9 for my fronts
and RTi A3 rears.

Do you know by chance what is the efficiency of these speakers?

Tomasito

ShinAce wrote: »

I don't think an SPL meter is going to help you, or even give you a good reading. You would need to trace the signal the speaker is receiving with a scope that records and then go back, check voltages, and roughly determine power from that. Either way, SPL meter is not worth your time and will not give you accurate or useful information. The pop is just too short for the meter to fully read.

I find it really weird that it would happen with the Rotel turned off first.

Have you tried taking the CD3 out for a bit to see if it's actually the cause?

Hello shinace.
that is a good idea, I'll test taking the CD3 out of the chain, and check if I hear a popping sound when turning off the system

McLoki

Tomasito wrote: »

hello Mcloki,
I don't know the efficiency of the speaker I am using. I am using LSi9 for my fronts
and RTi A3 rears.

Do you know by chance what is the efficiency of these speakers?

LSi's are 87db efficient. RTiA's are a little better at 89db

Tomasito

Ok here are the results:
1. I measured the popping sound with the SPL meter. it was between 50 ~ 70.
2. I disconnected the CD3 from the chain, and I get no popping sound.

I tried the a sylvania 6SN7 tubes which I just received yesterday. I was surprised that the popping was much much lesser.

What it caused by the chinese made tubes that came with the CD-3?

mantis

Tomasito wrote: »

Hello,

I recently connected a Yaqin CD3 in between my VSX94TH pioneer AV and the Rotel 1095 amp. Everytime I turn it off. A popping sound is made when I turn it off the system. The popping sound is loud

I think this is not good for the speakers.

I tried turning off the CD3 first, and also tried turning it off first and waiting for a minute before turning off the system. But I still hear the popping sound.

Is this normal?

If not , what might be the problem.

thanks

There is no need for this yaqin to be in your system. Remove it and send it back where it came.
On another note if you turn off the amp first wait a minute the caps will discharge and there can't be any pop. There will be no energy to do so. I'm assuming it has something to do with this inline thing. Get rid of it.

anhchungdoan

Both of my AVRs ( Pio SC 05 and Onkyo 876) never pop . The previous owned amp from Bryston ( 4BSST) popped a loud " TACK" in the speakers when turning off. I ended up sold the darned thing on Audiogon.

Pop is okay I guess( small amount of DC leakage ) but if it's a "thump", then you need to have it checked.

lanchile

* well it can be the amp that has a large power supply and it doesn't use output relays.

First, a power supply's job is to filter and store energy until the amplifier circuitry needs it. But when you turn the system off, that energy has to go somewhere. The "thump" you occasionally hear is the power supply capacitors dissipating the energy. It's not dangerous at all. In fact, it's just another sign that the amp won't run out of steam when you really want serious sounds.