MM-1 (Bower&Wilkins) USB speakers problems with OS Mavericks

Hi,
I use USB speakers, rather fine ones. MM-1 (Bower&Wilkins)
With Mountain Lion, everything was good. Ever since I switched to Mavericks, I have all sorts of problem with them.
In lin- in mode, everything is ok, but in USB mode:
I loose all audio sometimes when switching apps, or or for example, starting a video when music is playing from Rdio streaming.
A loud «pop» or "click" sound occurs in the left speaker when a video or a sound «initializes». e.g. opening a web page with a video in it.
Changing the audio out back and forth from USB to "internal speaker" sometimes bring sound back, but most of the time, only a restart will do.
Or to make everything explode:
Play music in Rdio, open Safari, launch a YouTube video, toggle multiple times between full screen and normal mode, then BOOM loose All audio until restarting the Mac.
Thank you!

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Apple>About This Mac>More Info>Service
Please read the warranty paperwork that came w/your computer.
You have 14 days to return the computer w/no questions asked.
You have 90 days of FREE phone tech support on top of your standard 1 year warranty unless you also purchased AppleCare which gives you an additional 2 years of coverage plus FREE phone support.
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