Curious, what are you using to angle your X Voce? I need to do the same....
Before I had the carpet pad and carpet laid down, I purchased some sound/vibration barrier for the floor that was made from recycled tires: 6.4mm Peacemaker Sound Barrier from AudiMute. The room is above my office, so I was trying to dampen as much as possible while staying within budget, and it works pretty well. What's under the X-Voce is a piece of scrap material from this rubber mat as a base, and then another piece rolled up to give it the angle.
