Hampden - Polk Audio , Mac OS X connection problem via usb

Hey all,
I just bought Polk Hampden they sounds pretty good =)
I'm very exciting ^_^
But unfortunately when I connect Polk speakers via usb to Mac OS X they didn't work =(
If I connect them to windows via usb they work perfectly!
Do I need install any additional driver for Mac OS X for usb?
2 other ways ,bluetooth and aux works perfectly for both mac and windows
But usb didn't work right now for Mac OS X
Thanks in advance
Kind regards,
Alex

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