Regarding Subs: I have a Behringer 1200 for use with my SpaceStation, but the little sub from my old Logitech Z2200 sounds just as good, and is way lighter.

Regarding sub outs: My Audya has 4, and can send the drawbars separately,and use my Neo Instruments Ventilator for a great Leslie effect. I don't suppose the SX900 can do this.

Bernie
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact