Yamaha DTXpress/DTXplorer/DTXtreme

Does anyone have suggestions on multimedia speakers I could hook up to
my DTXpress instead of using an amp.
I'm looking for a set with 2 smaller satellite speakers and a sub
woofer.  Preferably 75 watts or higher.  I'm currently using a bass amp
(at 75 watts) which works fine, but I figured with some multimedia
speakers I could better the same if not better results and in STEREO.
My plan is/was to mount the satellite speaker onto the rack and place
the sub woofer on the floor.
If anyone has any thoughts, suggestions, or recommendations, please let
me know.
I'm sure Yamaha makes a set of speakers for the kit too, but  I suspect
they're pricey.
Thanks