Can I use an isolation stand with an isolation pad?

I bought a 5.1 surround sound system recently, and got an IsoAccoustics isolation stand for my subwoofer. Unfortunately my neighbor below me can hear the bass if I'm watching a loud movie (in a condo, hardwood floors). I'm wondering if I should buy an isolation pad - like the Auralex Subdude HT - for under the stand, or if there might be a better approach? The music store I went to steered me away from isolation pads and towards the stand, but it's clearly not doing enough on its own. Thanks to anyone with advice!