Hi Roger
Here is the link: http://www.bose.com/controller?event=VIE...nment/index.jsp

Yes,There is a sub jack on the PAS to connect a third party sub if you choose. Since I already had a Z5500 sub,I use it with great results.
Bernie
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact