It should workMy immediate thinking is that I’d be amazed if they synched up accurately enough for this to work, but who knows.
Worth a try, let us know how you get on.
Use of Left & Right Channel settings with Riva Festival speakers
Well, they did a big favor to me that I discussed with their Support back in July. For several reasons I have an all optical audio/video setup where the sound ends up in two (very nice) Riva Festival speakers which have no L/R functionality (and no support as Riva seems to be out of business)...
forum.wiimhome.com
If you can drive the left and right speakers separately with a pair of minis I don't see why you couldn't drive a sub