Gentlemen,

How do you use a sub woofer with a Beomaster 6500 and still run two sets of speakers? I am using passive speakers. S 120's for that matter. 

Also any idea's on what type of sub to use? I have a Vandersteen that I like but it might not be the best match.

Thanks!

If you prefer passive, there is only one option from B&O, the BeoVox Cona. This is the only stand alone subwoofer I am familiar with. With the cona, you run both channels through it to filter out the low end frequencies.

If you prefer an active subwoofer, just use one of the powerlink sockets and let you're passive speakers operate simultaneously. The amp in the BeoMaster will operate the S120's in addition to feeding the signal for the sub of you're choosing.