I've done a bit of Google research on this and the subwoofer I come up with is the Samsung SWA-W700, but even second hand, it is VERY expensive !!
Are there any other cheaper compatible Samsung Subwoofers ?
I've just recently upgraded my TV to a Samsung TU7020 75" and I've just added this soundbar.
So I'm just wondering what the Subwoofer options are (just a subwoofer).