Harman Kardon isub issues

On my wk imac (g4, flat panel) I have a wierd isub problem...sometimes it'll just kick in really loud, sometimes not at all until I kick the sound up a hair, then all of a sudden it comes on. Sometimes nothing until I unplug the USB and plug it back in...it seems to kick start it then...any ideas??

It has...sometimes, I'll be listening and then all of
a sudden it'll really get loud. I plu it into the
USB on the machine, not a hub, and it still doesn't
make a difference. I have not been able to find
anykind of driver or updates. :/
yeah and certain programs will kill it also adjusting the volume seems like theres some kinda balance adjusting going on also in this bug

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    HK replied on my e-mail saying this problem is dispatched to a "higher technical department" and that they tested but did not get any disconnections. I suggested that they run a longer test as these problems might only occur after 10-15 minutes.
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