Impact - Vibration cancellation

Hi, I have an electronic drum which doesn't make sounds, but makes lots of vibrations (ie: impact). I am very preoccupied about my neighbors below, so I built a temporary floating floor made of two 6'x6' of 3/4" MDF squeezed between blue 'camping' mattress pads. The drum sits on top. It works well (ie: no more impacts/vibration), but as I knew it would happen: now the pads are too compressed :shock: . The spring effect is canceled. Now I want to build something for good and I want to see with the pros if it's ok. Here's the detail: *SIDE VIEW* DESIGN from TOP to BOTTOM VDRUM CARPET MDF 3/4" 2"x3" WOOD STUDS equally spaced MDF 3/4" NEOPRENE PADS equally spaced EXISTING WOOD FLOOR My plan is to fill the whole surface (between the two MDF and studs) with dry sand to have more mass. QUESTIONS: 1. With adequate thickness/size of neoprene pads, will the setup works? 2. Impacts/Vibration always travels the easiest path, I am concerned that it may just 'ignore' the sand and go through the studs ?!?!?! 3. Neoprene pads: thickness? size? type? (ie: cork etc..) Thanks for your help !

take it this way: is having more mass on the neoprene pad will help reduce impact resonnance?

For simple vibration cancellation I actually think you may be pretty good if you just lay down a couple layers of 2 inch exterior foam insulation, with some MDF on top of that. Maybe some rubber underneath the whole thing. I guess I don't really know, but you're not really talking about ALL that much vibration. There are obviously better solutions, but if you're looking for the cheap method I can't imagine this being too bad. There are things from Auralex called "U-Boats" that fit around a 2 X 4, then you set boards on that. Those are supposed to have a lot of isolation.