Have any of yall ever heard this sound before? (Not a hum, pop or crackle either)

[Braddock]

I know this is hard to convey, but here goes. Everytime, or it seems like everytime, I turn on my system and a source begins flowing out of the speakers, I hear what equates to a whistle. The kind of whistle one might hear when calling your dog. It seems to come from the direction of my sub. Its a quick sound, not an over and over sound. Just one quick subtle whistle like sound. Anyone??

 

[Braddock]

Yeh, I'll see if I can get a recording of it. Its not that big of a deal. It doesnt affect any playback or anything, its just an odd occurrence that baffles me.

Edit: I tried powering down and repowering up, and nothing. It seems to do it when the system has been off for a while. Ill give it a try after I get home form a movie tonight.

 

[Grador]

I can't say I've ever heard a whistling sound before, but from your description I imagine it has to do with the subwoofer amp powering on.

 

[Braddock]

Yeh, thats my thinking, but why? It does coincide with the sub amp powering up.

 

[Grador]

The best answer i could give you on that will be quite unsatisfying: poor design

 

[Stump909]

I get this, but it doesnt seem to be related to my hardware...or at least I dont think it is. I find it happens when watching recorded material. If I rewind, sometimes it'll play again.

 

[TLS Guy]

I know this is hard to convey, but here goes. Everytime, or it seems like everytime, I turn on my system and a source begins flowing out of the speakers, I hear what equates to a whistle. The kind of whistle one might hear when calling your dog. It seems to come from the direction of my sub. Its a quick sound, not an over and over sound. Just one quick subtle whistle like sound. Anyone??

Some part of the circuit is unstable and oscillating while the power caps charge.

 

[Alex2507]

Some part of the circuit is unstable and oscillating while the power caps charge.

Quite right ole chap! Seriously, that's it. I had a thread about a million years ago about something very similar. I believe they said it was a diode and transistor they had to replace. What got me was that it took 2 months or something. That sub is an Infinity PS-10 and I'm still using it years later. Infinity was good enough to do the work under warranty even though I couldn't find my receipt. I was still pissed that the repair shop took so long. The shop blamed Infinity for being slow sending out the parts.

 

[Braddock]

Recorded sound coming soon!!

 

[Braddock]

OK, tried uploading as an audio file and failed. So I changed it to a video and posted it to youtube. Heres the link. The sound is at the end of the clip. Ignore the actual video, I just used a random piece of a music video so Youtube would accept the upload file.

 

[TLS Guy]

OK, tried uploading as an audio file and failed. So I changed it to a video and posted it to youtube. Heres the link. The sound is at the end of the clip. Ignore the actual video, I just used a random piece of a music video so Youtube would accept the upload file.

Yes, it's an oscillation from instability some place.

 

[Braddock]

And...that means what?? A hookup issue, a hardware issue?

 

[TLS Guy]

And...that means what?? A hookup issue, a hardware issue?

It is almost certainly a hardware issue. If it were a hookup issue, there would have to be a signal feedback issue and then I don't think the oscillation would terminate.

I would bet the issue is in the plate amp of the sub, which are high failure, lousy designs generally.

 

[Nestor]

High frequency switching supplies are notorious for high pitched whines. Is it there all of the time?

 

[Braddock]

No, only when I power of my system. When a signal is sent out to all the speakers you hear that sound from the sub and thats it. I wonder if its affecting my sub quality?

 

[TLS Guy]

No, only when I power of my system. When a signal is sent out to all the speakers you hear that sound from the sub and thats it. I wonder if its affecting my sub quality?

That will likely come later in the form of a continuous loud buzz or total failure.