http://www.onlyfactorydirect.net/p/12%22+USB+Powered+Speaker++%7C+PP1204CA2/powered+speaker+usb+mp3/309/

$419.99. Only 300w (RMS) per but they're pretty loud. Great bang-for-the-buck.

chas
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"Faith means not wanting to know what is true." [Nietzsche]