Hi Tony,

The YST-MS50 speakers will work.
They are exactly the same as the Tyros speakers, except for the conections.
http://www.epinions.com/content_163692908164

Good luck

Eric
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Genos, PSR-S970, TC Helicon VoiceLive3, Mackie 802-VLZ3 Mixer, 2 Bose L1 Pro16, Electro-Voice ZXA1 Subwoofer