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I think I just killed my speakers. Help please...

post #1 of 8
Thread Starter 
I Think I just fried my floor standing speakers and have no idea what happened. So I'm coming here to ask for advice. I have the Pioneer VSX-521-k Reciever. I got it about a month or so ago. I love it, it sounds great. I haven't really had any issues with it at all.

I have the big pioneer 5.1 channel speaker set.

http://www.pioneerelectronics.com/PUSA/Home/Speakers/Home+Theater+Speakers/SP-FS51-LR

These are the speakers I think I fried. But not all the speakers, just the top ones! I use my reciever for everything, inclduing my computer. When I went to sleep I left my browser open and a youtube video paused. I woke up and turned my tv and reciever back on, and pressed play on the video and a VERY VERY loud SHREEKING noise started coming from all my speakers. It was deafening loud.. So I turned the reciever off quickly as I could, and smoke starting coming from my top speakers on both speakers...

I turned the reciever back on, and everything still worked fine, except of course the top speakers...

I can't hear the difference in the sound, but I really need to know what caused this issue guys please... I am taking the floor speakers back to best buy later today. Ive only had them a few weeks.
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post #2 of 8
The top speakers are the tweeters which reproduce the high frequency sounds of the spectrum (In the case of these speakers, everything from 2.5Khz to 20Khz). Everything below that i.e 45Hz up to 2.5Khz would be produced by the woofers(the other three speakers). The speakers should sound dull, as if there were a few blankets over them if the tweeters have blown.

Based on that fact that you say you saw smoke. I'd say the tweeters have definitely blown. If there was no smoke I'd say it'd be the crossover (responsible for splitting the audio and sending it to the different speaker components) inside the actual speaker cabinet, but the smoke is a pretty big give away.

The tweeters are the most sensitive of the speakers, the woofers would have needed much more to overload them and fry them.

From what I've read in their product manual, the speakers can withstand a peak input of 130W which is for a very short time. If this sound was as loud as you describe it to be then it was most likely over 130W and probably played for a few seconds. You're going to need to get these either repaired or replaced I'm afraid.

Good luck thumb.gif
post #3 of 8
Thread Starter 
Thank you very much for the response. I took the speakers back to best buy and got replacements. I tell you one thing, those people don't know anything about this kind of stuff. Sure, I don't either, but I don't get paid to know these things. The woman hooked them up and said "they still work" I was like, only the top speakers fried ma'am. She then placed her hand on the speaker "where the tweeters are" and said I feel them working. I said, ma'am you're feeling the bass from the other speakers, place your ear to the unit and you'll see they aren't working. Or just smell the speakers and you will smell that they have burned up.

Finally I talked them into exchanging them. They were 31 days old!

What I really want to know is whath could have caused this to happen.... To prevent the same issue from happening again.
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post #4 of 8
You've likely experienced severe signal clipping (either at the line level or amplifier level or both) resulting in very high power high frequency information to be run across the tweeters, a recipe for smoked tweeters that has a very high success rate.

My suggestion is to send the bill to whatever software writer is responsible for writing the software that caused the intense audio output from the computer. You won't get a dime out of them because I'm sure they are well protected behind plenty of layers of legaleze, but perhaps they will be made aware of the fact that their software is responsible for property damage.
     
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post #5 of 8
Quote:
Originally Posted by emailjustinbyrd View Post

What I really want to know is what could have caused this to happen.... To prevent the same issue from happening again.

To be honest it could be a multitude of different things; you say you powered on the receiver after you woke up so you must of turned it off before going to sleep. This means that the loud shrieking sound most likely came from your computer. Is it Mac or Windows by the way?
And is your computer connected to the receiver with analogue cables like phono/jack or digital cables like optical/HDMI?

The audio buffer simply could have gotten "stuck" and created a feedback loop of audio that was highly distorted or the sound card driver could even had crashed. Like I said, there's so many things that it could have been, maybe even a defective receiver.

Only thing I'd say for future reference is to make sure you turn the receiver on last so as to miss any loud pops that other equipment can create when powering up. Also make sure that volume is low or at least not abnormally high when powering up the receiver. smile.gif
post #6 of 8
Thread Starter 
Quote:
Originally Posted by anoma1y View Post

To be honest it could be a multitude of different things; you say you powered on the receiver after you woke up so you must of turned it off before going to sleep. This means that the loud shrieking sound most likely came from your computer. Is it Mac or Windows by the way?
And is your computer connected to the receiver with analogue cables like phono/jack or digital cables like optical/HDMI?
The audio buffer simply could have gotten "stuck" and created a feedback loop of audio that was highly distorted or the sound card driver could even had crashed. Like I said, there's so many things that it could have been, maybe even a defective receiver.
Only thing I'd say for future reference is to make sure you turn the receiver on last so as to miss any loud pops that other equipment can create when powering up. Also make sure that volume is low or at least not abnormally high when powering up the receiver. smile.gif


The way my reciever is set up, you run everything through HDMI and it switches over automaticly to whatever input you have it on. I turn my TV off and the reciever turns off too automaticly.. same when I turn the TV on.. the reciever comes on too..
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post #7 of 8
Yeah that's the same as my TV/Home cinema setup except it only turns off with the TV, not on frown.gif

Well then it was most likely your computer. Assuming you're using Windows 7, if you click on the little speaker icon on the taskbar it'll show you your output source and should also give you a level meter in the form of a green bar on the slider. You can use that to see if the computer is outputting any sound before turning your receiver on. If there's no activity, then go ahead, but if there's green on the slider that means the computer's outputting audio, probably the speaker blowing kind unless you're playing something you know of. Close & re-open the application creating it or restart the computer then turn on the receiver.

As a preventative measure, look into upgrading your sound card drivers, if you're not already on the latest that is. Also ensure your web browser, flash player version and overall OS is up to date. Other than that there's not much else I can recommend.

Fingers crossed it won't happen again.
post #8 of 8
Basically the voice coil melted. Some tweeters on heavy duty speakers will have bigger voice coils, some up to 3" (I'm guessing your tweeters have maybe ½" voice coils) and it wasn't able to dissipate all of the heat from the garbage pcm stream sent to the tweeter.
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