Yamaha DTXpress/DTXplorer/DTXtreme

has anyone successfully managed to soundproof their kick pedal so 
that other members of the household can watch telly in peace? i have 
experimented with several layers of carpets and other cusioning but i 
still get complaints from 'er downstairs' - note that i have 
headphones on.
i find that my house shakes - or is it that i am just overzealous 
with my kicks? i have had to move the kit to a mates while i consider 
my next plan of attack.
yours hopeingly