Find a way to bolt your stands to the floor (most stands should be easy to retrofit to suit this need). Speakers could be bolted or screwed to the stands, though the clay like stuff that I use (4 peas sized balls) makes it very difficult to remove the speakers from the stands (it takes a great deal of strength and twisting to remove them). I have Target (think that they are HR) stands which are filled with sand and lead and my wife has walked right into one of them without knocking it over, though with small childred I would again bolt (or screw) them to the floor. Spikes could still be used and the bolts or screws would just draw the spikes into the floor as much as is needed. I do not know how this would effect the sound, but it should still be better than other options.
Monitors are falling
I am soliciting advice ... opinions even ... on what to do with my rig. My stand mounted B&W CDM-1SEs were almost the victim of a knock down over the weekend ... by my wife of all people. This started the 'this is a living room not a media room' diatribe. Insult to injury is the fact that our first child is on the way. I beg you for suggestions ... ideas tto make the CDMs more stable or a really nice floor stander that I can get into in the $1,000 - $1,500 used range. All opinions are welcome and appreciated.