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PSU causing speaker noise?

post #1 of 15
11/4/12 at 8:49am
Thread Starter 
Just got my replacement X750 (for the one that went POP). Everything seems to run fine, except I now get a loud thump from the speakers and subwoofer when the PC is started up and shuts down.

It did not do this with the first X750, nor the cheapo Corsair I had in place while waiting for the replacement Seasonic.

Is the noise from the speakers being caused by the new PSU? Will I really need to go through replacement all over again?

Thanks.
-Chris
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post #2 of 15
11/4/12 at 8:51am
Get a ferrite core for the audio cable.
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post #3 of 15
11/4/12 at 8:54am
Quote:
Originally Posted by tsm106 View Post

Get a ferrite core for the audio cable.
agreed. they help a lot.
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post #4 of 15
11/4/12 at 10:07am
Thread Starter 
Ill give that a shot.

Im just more curious and annoyed as to why this started happening. Is it the PSU? The speakers? Interaction of both?

If it turns out to be PSU related, it will further my disappointment with Seasonic. Im still within 30 days from newegg and might consider returning this PSU and getting a different brand, probably a Rosewill.

I know I could take it up with Seasonic support but really dont feel like paying to ship it to them and waiting for a replacement to come back.

Note I also found that they will pop when the PC goes into sleep mode. They do NOT pop when coming back out of sleep. I also cannot hear any of these noises if I use a set of headphones instead of the speakers....but Im not sure if thats just because the headphones arent amplified so the volume is pretty low on them.
Edited by chrisexv6 - 11/4/12 at 10:32am
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post #5 of 15
11/4/12 at 11:12am
or the lanes in your mobo got over loaded and energry is jumping on start up frown.gif Fail bro !!!

See if the cord helps ... should cut down on the noise. We will see though frown.gif
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post #6 of 15
11/4/12 at 12:40pm
Thread Starter 
Quote:
Originally Posted by Jackeduphard View Post

or the lanes in your mobo got over loaded and energry is jumping on start up frown.gif Fail bro !!!
See if the cord helps ... should cut down on the noise. We will see though frown.gif

Not sure if joking about overloaded lanes.....

Gotta order up a ferrite core, or pay Rat Shack prices. Maybe tomorrow.
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post #7 of 15
11/4/12 at 1:32pm
Look at the cables under your desk and see if the computer power cord is tangled with the cord going to your subwoofer. The start-up current of the PSU going through the power cable could induce a current in the audio cable. Maybe. I'm not enough of an analog guy to know for sure, but it seems feasible. Try making sure the cords aren't tangled and are separated by a decent distance.

It's probably not the PSU itself, since there's no direct path from the PSU to the audio outputs.
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post #8 of 15
11/4/12 at 4:22pm
Thread Starter 
I tried to go back to the old corsair PSU and had the same results....pop when turning on and shutting down. Looks like not the PSU but I still don't know what is causing it. Made sure all audio video and power cables are well separated. I'm going to try plugging things into different outlets to see if the issue goes away.

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post #9 of 15
11/4/12 at 4:38pm
If it doesn't seem to be caused by the power supply, then that makes sense.

It's very common for audio electronics to produce transient signals (i.e. briefly nonzero) on power up/down. Capacitors don't charge up and discharge instantaneously—when the power supply rails for the electronics are changing during the power up/down, this can induce a signal on the output. Your speakers are just picking that up, like they would for any intentional signal from the system, and converting that into the pop you hear.

As for why you didn't get this before... dunno.

What changed about the system? Anything? What speakers are you using, how are you hooking them up, what are you plugging them into, etc.?
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post #10 of 15
11/4/12 at 5:33pm
Thread Starter 
I realized the little control pod has its own headphone jack for audio output. It was a simple test, just disconnect the speakers completely....Im talking no inputs or outputs connected. Just the control pod and power input for the speaker set itself (power goes into sub)

Sure enough, with headphones connected, the speakers make noise when powered up or down. Without the headphones connected, no noise. Clearly something is "coming across" on the output. Im not sure a ferrite core would fix the issue, I wouldnt know where to put it (I doubt it goes on the power cable....maybe on the cable from the sub to the control pod but Im not positive that would work either)

The speakers are Logitech x540. Nothing has changed about the audio, the machine has literally been sitting here for a week waiting for the new PSU to go in. Either it never happened or I never noticed it with the old PSU (since it makes noise when it goes to sleep, I figured I would have noticed it). Maybe just a horrible coincidence. Im going to try and borrow another set of speakers to verify but for the current minute or so it doesnt look like its the computer. Man what a strange set of events to set that off.
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