Logitech speakers with windows 7 desktop

Out of the blue my logitech external speakers started only putting out about 1/2 the volume they did before. They are USB driven and when I unplug the USB connection and plug it back in the volume goes up where it was before. It will only stay there as long as I leave it alone. If I select another song it drops down to 1/2 again. I have tried a lot of things from online posts but nothing works.
Any help!
mobilecomputerdocAsked:
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JohnBusiness Consultant (Owner)Commented:
I think the first thing I would try would be to re-install / upgrade the Audio Driver.

I assume you have tried a different USB port on the computer, and accordingly, I don't think it is a USB port problem.
mobilecomputerdocAuthor Commented:
I have tried other ports and my system indicates that all audio drivers are current. Logitech has no drivers listed for these. But if I unplug the usb and reinstall the volume doubles as long as I stay with whatever I am listening to. The minute I pick another selection the volume drops about 50%.
JohnBusiness Consultant (Owner)Commented:
Trying the other ports indicate it is not a USB problem. Two things left:

1. The Audio driver needs to be reinstalled (even though current).
2. There is a hardware problem with the speakers. Test the speakers in a different environment to eliminate the speakers.
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dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.Commented:
Try a powered USB hub in between the computer and your speakers.  Must be a powered one.

I suspect the computer is cutting the power being sent to the speakers for some reason.  A powered hub should fix that.  Note that I could be wrong.
mobilecomputerdocAuthor Commented:
Ok I will try that. Thanks!
JohnBusiness Consultant (Owner)Commented:
Did the speakers ever work correctly?
mobilecomputerdocAuthor Commented:
I tried them on another computer and the sound was loud at the high setting. After hooking them up to my desktop again I had the same problem. I changed browsers from firefox to google chrome and they worked fine. Then on Explorer they worked fine. Only in firefox listing to youtube videos does this happen. So to be clear when I first plug them in to my desktop they work at the correct volume until I go to the next song. Them 1/2 volume. Something is cutting down the volume after they are first recognized.
JohnBusiness Consultant (Owner)Commented:
Only in firefox listing to youtube videos does this happen

So given this description, I would uninstall Firefox (Programs and Features), restart, uninstall/reinstall the audio driver, restart again, and then install Firefox and try again.

It seems a stretch but I wonder if YouTube via Firefox is overdriving and so overloading the USB output.

Try setting the volume at 3/4 and see if the same thing happens.
dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.Commented:
Hmm.  That rules out my powered USB hub idea.

Firefox shouldn't be overloading the USB port.  In most cases YouTube sound and video is provided through Flash.  Check your Flash is running on the latest version and then try Firefox again.
JohnBusiness Consultant (Owner)Commented:
Firefox shouldn't be overloading the USB port

I noted it as a long shot, but IE and Chrome are fine with YouTube.

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mobilecomputerdocAuthor Commented:
This is the second time John has helped me. The internet is a good source but when I'm stumped the exchange finds an answer.
JohnBusiness Consultant (Owner)Commented:
@mobilecomputerdoc  - You are very welcome and I am always happy to help.
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