stacking speakers?

DBX: If your HT fronts and floor standers have removable grill covers, you could try placing a "solid" sheet of something (plastic or thick paper/cardboard) under them (to block the sound going to the unused speakers). This will help with the problem of the passive speakers "sucking" up the sound of the speakers being used and would be an invisible remedy, plus it would be easy to switch back and forth. Chances are that you will end up playing the speakers which are still blocked down the line (I know that I would forget and do this:-). This solid sheet should be somewhat reflective (in sound quality) and the grill covers will help to disburse the relected sound a bit. Should not be much worse than a typical "beefy" speaker stand, sound wise, and you can experiment with placement of the small speakers (on top of the larger ones).

I am kind of new to this high end stuff and usually read all the posts just to learn from those with more knowledge and experiance then myself, so this suggestion might sound off the wall but ,WHY DON'T YOU TRY STACKING THEM AND SEE HOW IT SOUNDS INSTEAD OF DEALING WITH THE POSSIBLE PROBLEMS THAT DON'T EXIST YET?

Tsugury, sure I coud have stacked the speakers first, had problems, then started asking questions, but why? Isn't that the purpose of these forums, To find answers to our questions before hand. Up until two days ago the words "Sympathetic Resonances" wasn't even in my vocabulary. I now know what it refer's to, and have several option for fixing the problem if I still decide to go that route. Being a novice on a budget, I can't afford the trial and error route.
I've read to many threads of people doing that and blowing amps, speakers, or whole systems. If it's something that I know with my limited knowledge, that won't hurt anything, then I'll do it, but why not gatherig as much information possible about something before doing it for the best possible results. What would be the use of these forums if we don't ask questions?

Sorry DBX, I guess I came through a little rough and should have explained myself better.As far as I know , there is no damage that can be done by stacking speakers on top of each other from two seperate systems ( except maybe scratchin the speakers, and be careful not to short any wires), maybe someone could correct me ?. So then, the only way I know of to see if, or how much the sound is effected is to try it out. Bottom line is your gonna have to try it, it will cost you nothing more then the time it takes to set it up. Then IF there is a problem with the sound you can identify the problem and (with the help of those in the forum) ,work on fixing it.